Table 2 Definition of reference lines

Horizontal lines

W1: Waist line

Waist point (waist height measurement available in the SizeUSA data)

↕

W2

The bisecting point between W1 and A1

A1: Abdomen line

Abdomen point (abdomen height measurement available in the SizeUSA data)

↕

A2, A3, A4

Points dividing the space between A1 and H1 into four

H1: Hip line

The most protruding point of the lower body on the back (automatically detected by the algorithm that was designed in this study)

↕

H2, H3

Points dividing the space between H1 and T1 into three

T1: Thigh line

The point 1 inch below the crotch (calculated using crotch height measurement available in the SizeUSA data)

↕

T2, T3, T4

Points dividing the space between T1 and K1 into four

K1: Knee line

Knee point (knee height measurement available in the SizeUSA data)

↕

K2, K3, K4

Points dividing the space between K1 and N1 into four

N1: Ankle line

The point of the thinnest circumference of the leg (automatically detected by the algorithm that was designed in this study)

Vertical lines

F1: Center front line

The front bisection point of the waist width

↕

F2, F3

Points dividing the space between F1 and FC1 into three

FC1: Front crease line

The front bisecting point between I1 and S1 at the thigh position

↕

FC2, FC3

Points dividing the space between FC1 and S1 into three

S1: Outseam line

The bisection point of the waist depth, and the bisection point of the ankle depth on the outer side of the leg

↕

BC2, BC3

Points dividing the space between BC1 and S1 into three

BC1: Back crease line

The back bisecting point between I1 and S1 at the thigh position

↕

B2, B3

Points dividing the space between B1 and BC1 into three

B1: Center back line

The back bisecting point of the waist width

↕

I2, I3

Points dividing the space between I1 and B1 into three

I1: Inseam line

The crotch point and the bisection point of the ankle depth on the inner side of the leg