Alas, most of them were too long! A cross between a shirt and a dress, and not an attractive look (I may wear jeans and t-shirts, but I still like to look neat and relatively put together). So...I just thought I'd hem them, but everyone online was talking about how difficult it was to hem a t-shirt. The fabric rolls and there's the problems of the stretch. The solutions offered were more complicated than a basic seamstress like me wanted to tackle. My deal no longer looked like such a deal.
Then today I found this video. I've never used a twin needle with two spools of thread, but I looked and yes, even my relatively basic machine has this feature. This looks doable. Sigh of relief here. When I get some time I'll be sewing again.
Any more tips on the best way to sew stretchy stuff?