1. Lay your garment on a flat surface
2. Iron out all folds and wrinkles, use side seams as a guide to lay it perfectly flat
Pit to Pit
Measure across the armhole, 'pit to pit
Waist
Measure across the smallest part of the garment
Hips
Measurement across the widest part of the garment near the hips
Length
Measure from top shoulder to bottom hem