The back bodice tight-fitting patterns (T) were developed from around 50 female trunk replica models by draping, and each pattern was divided into 9 “blocks”. In the previous paper, there was only a positive “gap length (DG
L) ” included in several side lengths (D
L) of bloks onthe back trunk surface development patternsover the corresponding side lengths (B
L) ofthe same body surface (D
L =B
L+DG
L), however, the several side lengths (T
L) on the T blocks had a positive or negative“gap length (TG
L) ”from -0.4 cm to 2.7 cm (T
L= B
L± G
L) . TheseTG
Lwere regarded as a key factor for covering the body's concave and convex shapes in the planar sheeting, but were not accurately known at the T stage drafting. In order to draftTfor each individual without draping, geometrical equations were set up by whichT
Lincluding gap lengths on blocks1, 4-9the back waist line and shoulder line for a dart can be estimated fromB
L. As a result, TG
Lwere readily calculated on a computer without draping, and could be utilized as an indication of the void between the body surfaces andT, and the bodily shape features.
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