Am I crazy or are t-shirt dress armholes getting BIGGER??

Maybe it’s just me but every t-shirt dress I’ve bought in the last 2 years has these huge gaping armholes where you can see my whole bra from the side. I reached up to grab something at Trader Joe’s and I’m pretty sure the guy behind me saw my entire left boob.

Is this a trend?? Am I supposed to wear a specific kind of bra?? I’m a 34C so it’s not like I’m overflowing. It just feels like they’re designed for people who never move their arms.