How tight should a swimsuit be? Should it crease at the chest when I pull my arms together for breaststroke?

For a women's swimsuit, are there supposed to be bra or any kind of support in it? Are your nipples supposed to show when you are cold when you have a swimsuit that fits?|||Your bathing suit should be really really tight. And if you are swimming in races there usually isn't any support. swim suits should be tight and smash down your boobs.|||The swimsuit is supposed to be able to stretch well over you whole body and there should be bra pads in the swimsuit to prevent guys having a free show at the pool. When you are wearing a swimsuit, it should feel like you're wearing a bra, no tight-er or loose-er then that. (; Lol.|||no, yes and a good fit means that you can't lift that straps in your shoulders really high there should only be a couple cm gap and the legs(if you have them) don't fill up with water or it goes down the front and fills up too