VIP rewards - good ones that really make you feel thankful! More tall people clothing, show models for different sizes and videos, size guides for each brand, next day express shipping, remove items from wish list if product is no longer going to be available (do not allow adding to wish list if product is discontinued). Better re-stocking of popular sizes.

Drop poor quality lines.. My biggest reasons for returns are inconsistent sizing across brands and item looking different to photos (usually looks a different quality/material hard to judge from photos) and item looking very different on me than on the model (body shape issue).