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You can swim in Dermmatch. The coloring stays on the scalp. But it doesn't provide fullness to the hairshaft. Depending on your hair texture and how thin it is, it may or may not be noticeable. You can test in the shower.
When I swim for recreation, I usually bring a nice sunhat and keep it near the pool to pop on when I am not in the water, and tell myself that wet hair on most people looks thin and just ignore it. When I have snorkeled or participated in water sports, I will wear a bandanna on my head (underwater even) and explain I like to keep my hair out of my eyes, mouth, face, etc. It keeps it looking cute, I keep extra dry ones and swap out a wet/dry one when I am not in the water, and it prevents scalp sunburning (and risk of skin cancer).