Is it any surprise that your tiny Japanese style bikini suits wear out if you keep oiling up your body and wrestling in them?
The oil will damage the elastane while many positions and holds will overstretch and damage the elastic and fabric.
Hand-washing the suit in warm water afterwards may help to get the oil and sweat out and make the suit last longer.
I am not suggesting you give up wresting in skimpy swimwear, I really enjoyed the body contact grappling we did in karate, but would suggest that you wrestle in suits you regard as expendable. Finding your favourite bikini mangled and droopy next time you need to wear it might spoil your day.
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