I don't see how T-shirts can be such a controversial topic. I wear them all the time. It's the only thing really practical to wear for many things I do- especially work that requires short or rolled up sleeves, when it's very warm outside. T-shirts are not traditional, but that doesn't make them immoral.
Considering the many problems in the world today, I don't think that how men and women attire themselves, as long as it is modest and suitable, should be such a concern. Do you think that on my Judgement Day, Our Lord is going to be concerned with whether I wore a green T-shirt when I was shearing sheep? Even if it did have completely unobjectionable print on it?
Just because something wasn't done before VII doesn't mean that to do it now is immoral! If that's the case, I certainly shouldn't be on this computer right now.
Some trad Catholics have a very gloomy and strange view of how we should live. I've even heard some say that it's often objectionable to laugh and that to show one's teeth when they smile is uncouth. I really don't undertand that point of view.