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I've been using this elastic for swimwear repairs and it's held up perfectly in the pool. The clear polyurethane is soft and thin, yet it stretches three times its length without losing shape.

Three meters of this stuff turned my old bikini into a completely different suit, and the fact it’s chlorine resistant sold me since I live in the pool. The thin, soft feel is a bonus — it’s barely there against your skin but holds its shape through a whole summer of laps.

I've been using this for my swimsuit repairs and it holds up great, plus it stretches exactly as described without losing shape. The thinness makes it easy to sew through delicate fabrics, and the chlorine resistance is a nice bonus for pool use.