1 - Neck
2 - Under chest
Measure your under-chest circumference, as a measure of the lower part of your bra.
3 - Waist
Measure the narrowest part of your waistline.
4 - Little hips
Measure the part of your little hips, as if you're wearing a string.
5 - Thigh
Measure each thigh, to the biggest part.
Finally , measure from the point A to B & indicate your bra cup.