What exactly are you allergic to ?
Does you allergy include nylon and Lycra fabrics?
Virtually all the thread used to sew swimwear with is polyester, does that effect you?
Are you ok with elastic and elastane (the stretch factor in Lycra)?
I have some bamboo silk, it's organic and really nice stuff, I even have organic cotton thread to sew it with. I had intended to make Japanese style fundoshi loincloths, that stay up without elastic.
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