Size Small fits between a size 2 and 6, while a medium also fits between size 4 and 8, etc. The most noticeable difference between the sizing is the length of the leg.  These do not have a tendency to run small, but they are designed to be fitted for activity.  

Sizing is approximate.  The model is wearing a size medium.

• Small: 2-4-6 - - Waist (25-26) Inseam (31)
• Medium: 4-6-8 - - Waist (27-28) Inseam (32) 
• Large: 8-10-12 - - Waist (30-32) Inseam (33)
• XL: 12-14-16 - - Waist (33-35) Inseam (33)
• 2X:  16-18-20 - - Waist (36-38)  Inseam (33)

Also, check out the Batikwalla Shopping Policies page for additional info about purchasing and returns.