It seems as if ModCloth only carries a select number of sizes in each garment. Even though it looks like they receive new inventory every day, it you see something you like, you better snatch it up in your size right away!
The website layout is pretty user-friendly and the return policy is fairly, standard (30 days with tags for most items). The only suggestion/recommendation I have for those running ModCloth is to include a "wait list" option for those items that fly out of the store too quickly. There were a few items that were out of my size that I wish I had the opportunity to order.
Also, if the store won't be restocking a particular item, take it off the website. There is nothing worse that spotting a great item, only to see that it is sold out! What a tease.
Pricing is pretty moderate across the board, with most dresses $50-$100, tops $25-$60, bottoms $35-$75, shoes $30-$100 and outerwear $40-$110. ModCloth.com earns an A- from my first look!