I think very revealing clothes are tacky, no matter what the actual garment. When I was young I had an incredible ballet-dancer's body but I never dressed in such tiny clothes. I was always aware that it looked cheap and desperate. I didn't dress like a nun, but I certainly didn't reveal my bum, breasts, and midriff.
If people want to look cheap, that's up to them. They have no style, imo.
I do think that thong bikinis and very tiny string bikinis should be banned at public pools. It's a matter of public decency when it comes to fully naked bums in thong bottoms. And some of those string bikinis are just a few cm away from full nudity.
The fact that people are showing off their bum cheeks comes as no surprise to me, given the ever-decreasing clothing sizes of the last 15-20 years.
I think it's really sad that women's bodies seem to be more sexualised and objectified than ever before, and clothing fashions are smaller than ever. It's become the norm for breasts to be at least half-out, plus midriff out, plus short and/or tight bottoms, plus stripper heels. I came of age in the early Nineties, which was a much more covered-up decade, but I think we are in an anti-feminist era and all the tiny clothing trends reflect that. Plus social media and filters that make people look perfect with big boobs and flawless skin all over etc. I think it's a crying shame for young women today.