I think the mens Uniqlo U t-shirt has to be the best t-shirt of all time. The black one I have had for about 2 years now, and it's been worn to death, washed so many times, and as still as good as new! I bought some in some different colours to spice things up a little. I wear a size small, and I prefer the fit of the small men's as opposed to the women's in a size too big.
Shop here, I will show you the other colours too! This one here is the navy blue one.