Sizing for different brands

[JamesSwim]

I actually checked the one Speedo brand suit I have, and when compared against several other brand suits, the Speedo is indeed larger around the waist for the same size. So it seems that Speedo brand's sizing guide is correct. (See URL below)

You need to measure your waist, and then downsize by two to three inches. The amount depends on the size. The larger your waist, the less (2") you downsize. But with Tyr, for example, I do not need to downsize.

So I realize trying it on is the best thing, but if you want to buy by mail order, I want to share the lesson you can avoid mistakes. As Byron, louis and others said, it is really difficult. But at least for Speedo brand, I think I figured it out.

http://www.speedousa.com/product/siz...oryId=15682446

[Torchwatch]

Sizing is a bit complex, it depends on the length and stretch of the elastic and also on the cut and stretch of the suit fabric. Getting both the elastic and the fabric cut correct is the skill of the designer, but since everyone's body is different the wearer must then find the brief that not only fits but also suits him, this is such a tough unkind world.
Then as your perfect swimsuit ages the elastic may disintegrate and the fabric go saggy and you are back to square one.
I hate saggy suits where the ass stretches down towards the knees, an ill fitting suit looks better than a worn out one.

[JamesSwim]

Yes, I noticed that suits age and change. A polyester suit I had was tight -- almost painfully nut crushing if you swam in it for a long time, so I didn't go swimming in it. But I tried it on recently and it was fine. I thought poly suits did not stretch as lycra/spandex does, but who knows, maybe I lost weight, or maybe it stretched out even without much use.