I'm not sure if you know about asking for fashion advice. Here's one I like to use. "I've been looking for those artist inspired t-shirts lately, and I haven't been able to find any with cool tiger designs on them. Do you guys have any thing like this?" The Brass Buckle has a lot of t-shirts. You can go there for practice. I've found mainly you actually have to be looking for something in particular to sound authentic and to generate curiosity and attraction in the girl. When you get some IOIs you can do a quick cold read or something, then turn away to look at a t-shirt that catches your attention. If the manager is around, the plausible deniability might be more in check with the girl so she doesn't seem like she's getting too flirty with you. However, some of these places actually sort of encourage the girl to be more flirty, especially if the sales girl works on commission. Don't fall for the "doggie wanna' bone?" baiting of the chick. She's testing you to see how desparate you are. Last, but not least, put LOVE into what you do. As a social artist, you want to give the warm, loving charisma into your interactions, like an artist just loves the pictures he paints. Even if they are problem children. Especially if they are problem children.
Enjoy Bro!
eVan