I love buying T-shirts from Levi's just because they have really nice bright coloured t-shirts as well they're comfortable. Levi's have a lot of bright coloured t-shirts and I've bought a couple of green, yellow and red ones from them.
I love that it has a thicker layer around the collar so even after a lots of washes, the collar doesn't enlargee. Also, the fitting is just nice - not too big and not too small. Although it's cotton, it's a bit thicker than ordinary t-shirt's cotton and I love it!
The only problem I have with it is, with the yellow t-shirt, it becomes furry after a few wash, although the other ones don't. I think you'll have to wash in in cold wash.
Other than that, in terms of style, Levi's is definitely catered for young people. It has all these funky designs and words.