I am very interested in exporting fabrics and jewelry to the U.S. for an online clothing business I am involved in... Plus, I believe the clothing would be very popular in Turkey.... and I would like to import them to Istanbul if it is possible...Any suggestions/advice?

Well, if you are exporting from Turkey to USA, you may contact exporter Turkish companies for details. Noone would know better than them.As for importing to Istanbul, big brands maybe popular (and lots of them make local production), but I don't know who would buy a no-name clothes brand in a textile exporting country, no offence meant.If you trust your designs, you may try opening shop here and have your designs produced here. At least your products will be reasonably priced.