Fashion Designer Garment Construction & Tailoring 2 — Questions and Answers
Question 1: What is 'grading' in pattern making and why is it necessary for commercial garment production?
- Assigning a quality grade to a finished garment
- The process of proportionally increasing or decreasing a base size pattern to create a complete range of sizes while maintaining the garment's design proportions (Correct answer)
- Testing a pattern by constructing a trial garment
- The process of transferring pattern markings to fabric
Correct answer: The process of proportionally increasing or decreasing a base size pattern to create a complete range of sizes while maintaining the garment's design proportions
Pattern grading scales a single size base pattern up and down across a size range by applying standardized grade rules at specific points, enabling production of a garment design in multiple sizes without redesigning each separately.
Grading adds (or subtracts) specific amounts at defined pattern points, not uniformly across the entire pattern. Grade rules distribute measurement increases proportionally: a one-size increase might add 3/8 inch at side seams and 1/4 inch at shoulder seams rather than simply enlarging the entire outline. The cumulative effect should produce a larger (or smaller) garment that maintains the design's proportional relationships. Modern CAD grading systems (Gerber AccuMark, Lectra) apply grade rules automatically and calculate fabric consumption across the size run.
Question 2: What is an 'invisible zipper' and which technique ensures it remains truly invisible when installed correctly?
- A magnetic closure designed to replace visible zippers
- A zipper with the coil folded to the back of the tape so the coil is hidden in the seam; proper installation requires pressing the coil open before stitching and using a specialized presser foot to sew directly beside the coil (Correct answer)
- A zipper applied underneath a placket that obscures it from view
- A zipper sewn into a seam before the seam is pressed and topstitched
Correct answer: A zipper with the coil folded to the back of the tape so the coil is hidden in the seam; proper installation requires pressing the coil open before stitching and using a specialized presser foot to sew directly beside the coil
Invisible zippers are designed with the spiral coil rolled to the back of the tape. Installing them correctly requires unrolling the coil by pressing with a warm iron, then sewing with an invisible zipper foot that feeds the unrolled coil through a channel that allows stitching right at the base of the coil.
Standard zipper installation techniques do not work for invisible zippers. The invisible zipper foot has two channels that ride along the coil, allowing stitching 1 to 2mm from the coil base, closer than any standard foot allows. The zip must be applied before the seam below it is sewn. Common mistakes include using a regular zipper foot, not pressing the coil open, stitching too far from the coil, or closing the seam below the zipper before confirming the zip lays flat.
Question 3: What is 'boning' in couture and structured garment construction, and what materials are used?
- A technique for reinforcing trouser creases with starch
- Rigid or semi-rigid strips inserted into channels in bodices, corsets, and strapless garments to provide structural support, maintain silhouette, and prevent garment collapse (Correct answer)
- A method for padding shoulders in tailored jackets
- A type of interlining used in collar construction
Correct answer: Rigid or semi-rigid strips inserted into channels in bodices, corsets, and strapless garments to provide structural support, maintain silhouette, and prevent garment collapse
Boning consists of rigid or flexible strips (historically whalebone, now typically steel, nylon monofilament, or polyester spiral boning) encased in sewn channels that give structured garments (corsets, strapless gowns, bustiers) their shape and support.
Boning types and their applications: steel boning (most rigid, used in corsets and heavily structured garments, both flat steel and spiral/coil steel); nylon boning (semi-flexible, less expensive, used in formalwear bodices and prom dresses); rigilene (woven polyester, very flexible, used in lighter-weight evening wear). Boning channels must be positioned to control specific stress points: typically at side seams, center front/back, and over the bust, not distributed randomly.
Question 4: What is a 'flat-felled seam' and where is it most commonly used?
- A seam where both sides remain flat without pressing
- A fully enclosed seam where one allowance wraps around and encloses the other, then topstitched flat, creating a strong, durable, and neat-finished seam used in denim jeans and work shirts (Correct answer)
- A technique for joining two pattern pieces without visible stitching
- A decorative seam technique used in luxury evening wear
Correct answer: A fully enclosed seam where one allowance wraps around and encloses the other, then topstitched flat, creating a strong, durable, and neat-finished seam used in denim jeans and work shirts
The flat-felled seam (or felled seam) encases both raw edges by wrapping one seam allowance over the other and topstitching flat, producing the characteristic double-stitch line on the exterior with no exposed raw edges on the interior: essential in denim construction.
Flat-felled seams are constructed by: stitching a standard seam, pressing allowances to one side, trimming the under-allowance to half, folding the wider allowance over the trimmed one, and topstitching. On denim jeans, the inseam and outseam use flat-felled construction. The seam is exceptionally strong (two rows of stitching), adds minimal bulk (fully pressed flat), and is fully finished on both sides. Industrial flat-felling machines construct this seam in a single operation.
Question 5: What is 'underlining' in couture construction and how does it differ from interlining and lining?
- All three terms describe the same technique
- Underlining is a backing fabric cut identically to each garment piece and basted to it before construction, adding body and hiding construction details; interlining adds warmth or structure between lining and outer; lining is the interior finishing fabric (Correct answer)
- Underlining is the outermost layer of a formal gown; interlining the middle; lining the innermost
- Underlining adds decorative contrast color visible through sheer outer fabric
Correct answer: Underlining is a backing fabric cut identically to each garment piece and basted to it before construction, adding body and hiding construction details; interlining adds warmth or structure between lining and outer; lining is the interior finishing fabric
These three distinct construction layers each serve different purposes: underlining adds body/opacity to fashion fabric and conceals interior seams; interlining provides insulation or additional stiffness between lining and shell; lining provides a clean interior finish and improves wearability.
Underlining (also called mounting) is cut identically to each fashion fabric piece and basted together before construction, so the two layers are treated as one throughout assembly. Benefits include: adding body to lightweight fabrics, making dark fabrics opaque, providing a soft interior surface for hand stitching, and creating a stable base for embellishments. Interlining (e.g., batting in a quilted jacket, horsehair canvas in a suit chest piece) is internal structure. Lining is the final interior finish. Some couture garments use all three layers simultaneously.
Question 6: What is the purpose of 'notching' and 'clipping' curved seam allowances?
- To decorate the fabric edge with a decorative pattern
- Clipping removes small triangles from concave (inward) curves to allow the seam allowance to spread and lie flat when turned; notching removes wedges from convex (outward) curves to allow the excess allowance to compress (Correct answer)
- Both techniques reinforce seam strength at curved areas
- Notching and clipping are only required in knitwear construction
Correct answer: Clipping removes small triangles from concave (inward) curves to allow the seam allowance to spread and lie flat when turned; notching removes wedges from convex (outward) curves to allow the excess allowance to compress
Curved seams require different techniques: clipping into concave curves (like a neckline) allows the tight allowance to fan out; notching convex curves (like a collar outer edge) removes excess fabric that would create lumps when turned.
The geometry explains why: a concave curve (bending inward) has less total length along the cut edge than the seam line; clips let the allowance spread to accommodate this. A convex curve (bending outward) has more length at the cut edge than the seam line; notches (small V-wedges) removed from the allowance eliminate the excess that would otherwise bunch up when turned. Both are cut perpendicular to the seam line, close to but not through the stitching.
Fashion Designer Garment Construction & Tailoring 2
What is 'grading' in pattern making and why is it necessary for commercial garment production?