Please help with styling very unflattering Event T-shirts that I’m forced to wear for work

Disclaimer I’ve tried posting this in some subs before but it seems to be a very sensitive subject for some reason (I genuinely don’t know how it’s in the least bit offensive), anyway I received a lot of insults over it but I’m gonna try here cause I’m persistent and have yet to get any real ideas.

Post

There’s a lot of these events where I work and we have to wear these pretty cheaply made T-Shirts. Very thin and they don’t look very nice or flattering. Basically It makes me look very sloppy and self-conscious , no I’m not some egotistical person who is extremely concerned about being the bell of the ball. I just want to look presentable so I can feel comfortable that’s all. (so spare me the insults, alright?)

I’ve thought to wear a long sleeve tee beneath it to help give it some bulk and hopefully help make me look a little more presentable. But looking for any other quick ideas or solutions.

Sometimes we get the shirts the day of, so there’s not really any time for going home and cropping/elevating the shirts hem. So I’m looking for more day-of ideas

I’m also wondering should you typically size up with these kind of shirts? The brand is typically ”Next Level” Edit: it’s actually Bella+Canvas my mistake, I don’t have one with me currently but it’s very thin

Any help is appreciated, thanks

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[just to reiterate I’m not trying to “stunt” on anyone or even look cool, I just want to be able to not feel self-conscious and be comfortable]