Measurements are best compared against a similar item of clothing rather than against your body.

Measurements are taken along one side of garment lying flat (double for all the way round). Be sure to check over measurements carefully as some items may be pinned to show their correct fit. Model is a 5’7 XS-S.

Bust - armpit to armpit 
Waist - smallest width across mid-section
Hips - if item is lined we measure the lining to ensure a comfortable fit
Length - top of shoulder seam (next to collar) and straight down to hemline

If you're unsure please don't hesitate to ask, better to ask questions now than be disappointed later!