You can take those in by hand, you know, if you like. T-shirts are pretty easy to work with. I can give you some tips--or any of the real sewers here, who I'm sure would be much more helpful--or there are plenty of YouTube tutorials and such. I mean, if you want to bother, which it is perfectly reasonable if you do not. (I just realized you didn't actually specify that they are t-shirts. Cotton button-down type shirts are even easier to work with for hand-sewing, because there's less give/stretch in the fabric. It just requires the merest touch more prep work. Again, plenty of people here to offer tips, if you so desire. Just say the word.) Perhaps they're men's maternity shirts? You know, for all your pregnant tranny needs? ;-) Sigh, they're probably just cut with a mind to the ridiculously exaggerated silhouette that the phrase "dad bod" has come to describe, instead of the fit-but-a-little-soft-in-the-middle body that it was originally supposed to describe. Now we have absolute tubs walking around talking about their "Dad bod," like it's just a synonym for "lardball."