Costume Details Reference Sheet
My daughter is a costumer for theaters, and she uses this sheet at the beginning of each show to take all the relevant measurements for each character/actor. Some of the items might seem odd, until you remember that sometimes a female plays a male character and vice versa.
The bottom part of the form tracks who did what alterations, repairs, etc.
At the end of the show, she files the form and builds up her library for future reference.
The Open Office template is included if you want to use this as a starting point for a personalized size reference.