J. Crew is where I get most of the stuff I wear to school (especially shorts / pants). J. Crew is pretty expensive, but they have nice looking clothes and always have my size, which is convenient because finding pants that fit is difficult.
I like to pick up T Shirts from places I go as "souvenirs," so I have a ton of T Shirts from random places.
I buy nicer clothes, like button up shirts and blazers and whatnot, from larger department stores because they look fine and going to a place that specializes in dress up clothing just causes me to spend more money for something that isnt much better looking than a cheaper version.
When I rarely have to buy them (holidays ftw), usually it's Target, perhaps Kohl's. I fucking hate clothes shopping. I also don't care at all about brands, especially because you get transformed into a walking advertisement.
whenever I buy clothes, I know exactly what I want. This way, I can walk into stores, buy a pair of jeans and a t-shirt, and maybe a sweater or something, then walk out, and be done with all my clothes shopping for the newt 6 months.
aside from that, I get most of my jeans from AE (35 dollar relatively unripped "designer" jeans :D ), and I get a lot of shirts from puma and old navy (seven dollar shirt = pretty cool deal.)
Garage sales and some thrift shops. I've gotten more cool shit out of them than I've seen in retail stores. I have more than enough well-fitted clothing though (so long as I keep up with laundry) so I don't do it too often.
Primark usually. Sometimes Asda. When I was in Cambridge the Asda was miles away and there was no Primark so sometimes I'd resort to M&S - especially when I'd left it till the day of a black tie dinner to buy a dress shirt. I'd rather spend my money on music, electronics, or books than clothes.
I shop at AE because almost every clothes store here is one of those "big" ones. But I choose AE because all of the other ones have logos that make the item look bad. To me AE's logos are the most bearable.