Here is the thing I only worked out this year, at 67.
I used to buy my swimsuits the way everyone does, off a rack, in whatever the biggest size on the hanger was. A regular suit made longer in the leg and wider in the hip, but the same length through the body.
So the straps cut into my shoulders within the hour. The top rode up the moment I sat down, and the middle of it never quite reached the bottom half. I would spend the whole day pulling at it, and the second I stood up out of the water I would be checking that everything was still where it should be.
Then I would put the T-shirt back on over the top and decide the water was a bit cold anyway.
Twenty years of fitting rooms and I had drawn the obvious conclusion. The suits were fine, so it must be me.
It was not me. It was the suits. They were not built for this body. They were built for a smaller one and stretched.