Workout Wear (including swimwear)

Not too long ago, I posted a query on the PatternReview.com message boards about workout wear and sources for Spandex. I want to make sure I remember some of the answers, so I'm posting to the blog:

Some sources for workout wear (including swimwear):
EmmaOneSock
Spandex House
Spandex World
Lucy's Fabrics

I also found this thread on the message boards. Some recommended fabrics for workout wear from the experts on PR include:

ottoman knit (examples: http://www.lucysfabrics.com/Bottom-Weight-Fabrics/Ottoman-Rib-4-way-stretch-BROWN/
http://www.fashionfabricsclub.com/catalog_itemdetail.aspx?ItmID=A796)

doubleknit rayon (example: http://www.emmaonesock.com/fabrics/rayonblenddk.asp )

rayon blends (60% rayon, 30% nylon and 6% spandex)

Knits with cotton were discouraged as these tend to stretch out within an hour or two of wear.

I bought several fabrics from Spandex World last month. I'm in the process of making some workout pants from one of the fabrics. They're a blue cotton lycra that I got from Spandex World (90% cotton, 10% lycra) for $6.00/yd. (bought 1 yard) and have 4-way stretch. Loved sewing them, but the fabric is not as heavy as I would have liked and clings in areas where I'd like a little more padding. Next time, I may need to underline, if I use the same type of fabric. Will see if these stretch way out of shape after I begin using them.