It shouldn't be uncomfortably tight. Mine fits like a thinner swimsuit, basically. It's form-fitting but not cutting into my body anywhere. Hard to describe. It will have a little more give when wet, but not a whole lot if it's well-made. I had to wear a second sports bra under my danskin tri suit but not under my zoot one up to olympic distance. The danskin was comfy but not compressive enough.

Welcome to the forum!