Points of difference.
How do you differentiate from your competitor considering the vas amount of oonline boutique available. And given scape underground outlets which mostly consists of shops/brands that already have a online presence. Or rather starte with a oonline boutique.
What teddic mentioned is known as a loyalty programme which is implemented by most stores already, so that isn't really a USP.
Overall I think although the market is relatively huge, it has already been monopolized or dominated by small groups of people already.
My above comment is based on the assumption that you source your apparels oversea and import over. It doesn't apply if you're designing your own.
Speaking from experience as I have friends setting up online store to renting flea market space and now having their own boutique @ scape underground.
Just my 2cents worth. Sorry if I derailed the thread.