I've had trouble with the shirts showing up as well. I went to BodyShop and exported the files. When I opened the texturenames and alphas, I was able to cut and paste the images that are on the t-shirts onto black t-shirts for each age and gender.
If the tight shirt does not show up in game, I would suggest this. I've had to create BodyShop projects this way before, when I download from the main site. (Sometimes on the main site, people forget to credit where they got their meshes from, etc.)
Hope this helps...
Don't worry; you're just as sane as I am...
~avatar by AyneGreensleeves~