The one piece of clothing I own that outnumber any other is my T-shirts. Black, blue, green, yellow, red, white and browns. In huge numbers. I'm a sucker for tees, and I rarely throw any of them out (unfortunatly).

Here's a bunch of links to my favourite unique shirts.

SuperFancy
http://shop.superfancy.dk/
Very nice collection - a few of them references Danish pop culture, in case it didn't make any sense.

Naature
http://www.naature.com/
While not that frequently updated, these designs are abstract in nature, and delicious.

Funkrush
http://funkrush.bigcartel.com/
Funkrush has a lot of different styles, most colorfull and good fun.

Mustache
http://shop.mustache.dk/
Still new, and only have a limited collection. Still nice, though.

McKorman
http://www.mckorman.com/t-shirts/
A local shop of mine, with a limited collection. Danish only, but nice.

Threadless
http://www.threadless.com/
Most know this, which has led to more than one episode of wearing the same tee at work. Best thing about Threadless is that its frequently updated with new designs by different designers and have a huge collection.