Shoulder slippage (kandhe girna) is the single most frequent customer complaint encountered by custom tailors. When the back neck depth increases beyond 6 inches, the physical cross-back tension is eliminated, causing the shoulder straps to splay outwards. This guide details the master reduction formulas, armhole slant corrections, and chest ease adjustments required for deep necklines from 7" to 12"+.
1. Back Neck Depth & Shoulder Deduction Chart
Always apply this standard master formula before drafting the shoulder and armhole lines:
| Back Neck Depth | Classification | Full Shoulder Deduction | Drafted Shoulder on Fold (14" Body) |
|---|---|---|---|
| 0" to 3.5" | High Neck / Collar | 0.0" (No deduction) | 7.00" |
| 4.0" to 5.5" | Standard High Round | Deduct 0.75" | 6.62" |
| 6.0" to 7.0" | Medium Depth | Deduct 1.25" to 1.50" | 6.25" |
| 7.5" to 8.5" | Deep Neckline | Deduct 2.00" | 6.00" |
| 9.0" to 10.5" | Very Deep Back | Deduct 2.50" to 2.75" | 5.62" |
| 11.0" to 12.5"+ | Ultra Deep / Backless | Deduct 3.00" to 3.25" | 5.35" |
2. Step-by-Step Drafting Adjustments
- • Shoulder Slope Reversal: Slope shoulder 0.25" towards the neck edge for deep backs (8"+ depth).
- • Armhole Down Recalculation: Reduce armhole depth by 0.25" to 0.50" when shoulder width is deducted.
- • Bias Piping Tension: Pull bias tape with 10% tension while sewing deep neck curves.