I don’t see a problem with guys not having shirts on. As long as they are in the appropriate place ie: it is not appropriate to go shopping, or to work without a shirt.
My brothers exorcise without their shirts, and so does my dad. It isn’t a problem for me. The thing I don’t like, and I have seen it amongst boys my age, is when the boys start touching their naked chest and stomach. I don’t like speedos, but to Europeans, it is just the way they do it, so:shrug: The thing I hate the most is sagged pants. YUCK!
As far as women go, I agree that many bikinis are too showy, but believe me it is almost impossible to find a decent one. I wear a bikini because I want my mid-riff tan because if my shirt comes up, I don’t want an iridescent back or stomach showing.

I wear little shorts instead of the underwear style bottoms, and I try to get a straight cut top, though it is getting harder and harder to find.
My mom wears tank-tops in public. She is married, and so that is fine in some places. Like, the Catholic school where my younger sibling go, they asked that women don’t wear tank-tops because lots of women wear them too low and show cleavage. But to soccer games, or when she is going to be in the sun.

My sisters and I don’t wear tanks in front of boys or men, not even our brothers or our father, but when they are not around, tanks are fine.
In Europe children swim naked, now that is gross!
We were always taught that a girl should wear sleeves at church, and modest shirts that don’t show cleavage the rest of the time. Shorts should come at least half way down the thigh and skirts should at least touch the knee. The back can be totally bare.
Earlier someone said that two men asked her to dress a little more modestly. If they yelled at her, then they were wrong, but here let me tell you this.
There was a girl at church one Sunday, she was wearing a wife beater shirt, that came up above her belly button and low-low pants. She kept bending over revealing her playboy tattoo. My dad moved himself and my two brothers to a different pew. After church he went up to her and very nicely asked that next time she make sure her shirt came down and her pants up and that she should wear a shirt that covered her shoulders (This is just considered modest in church for Catholic women). The girl flipped out. My dad was asking her nicely, and not just for himself, he doesn’t really have a problem with that, but also for my brothers, and any future men who might sit behind her, he was addressing the problem.
There is a right and wrong to dress, there is a time and a place for somethings, and other things just don’t belong anywhere. Here are the rules I follow for myself, and the rules my brothers follow. As you can see Girls have it a little harder:shrug:
Girls:
Church:
Sleeves that cover shoulder, skirt that at least touches knee, no words on shirt, not a tight shirt or skirt that shows every curve, no cleavage or mid-riff showing, dress shoes, dressy shirt and skirt or dress. Dress up for God. He doesn’t care, but he cares that you care.
Other places:
No cleavage or mid-riff, no sagging pants, no tight shirt or pants that show every curve, shorts that come half way down calf at least, skirts reach knee, no tanks unless you are married and then still no cleavage.
Swim wear:
Straight across top (if possible), otherwise as modest as possible, that looks good, bottoms shouldn’t sag, and should fit, I like to wear little shorts, but that is just me.
Boys:
Church:
Collared shirt, long nice pants, no jeans or torn pants, no shorts, no shirts with words, belt, coat and tie for Easter and Christmas, dress shoes. Dress up for God. He doesn’t care, but he cares that you care.
Other places:
No sagging pants, no skinny jeans, no super tight shirts, no girly wear.
Swim wear:
trunks that stay up and don’t sag, they should reach the mid-thigh at least, unless it is a speedo, but please don’t wear these!
Someone said earlier that the Church sees men and women as the same. That is untrue, we may be the same before God, but what is required of each person is a little different. We were made differently, we have different needs and different requirements, we should accept these joyfully! God made me a woman, I should be happy to restrict how much of my body I show, I shouldn’t cry and throw a hissy fit saying it isn’t fair, because God made me this way, so I should be happy about it.

Have a WONDER FULL day all.