Leggings, biker shorts, a swim bra and cork yoga mats. All of it made for people who train and then go get in the water, or the other way round.
Swim leggings work as gym leggings
Same four-way stretch, same wide flattering waistband, but the fabric is swimwear-grade: moisture-wicking, quick-drying and treated for constant water use. That means no soggy heavy fabric after a sweaty session, and no sweat patches showing. They dry faster than standard gym leggings, which is the whole reason people end up wearing them for both.
Cork yoga mats
Cork grips better as it gets wet, which is backwards from most mats and exactly right for hot yoga. It is naturally antibacterial so it needs less cleaning, dense enough to protect knees and wrists, and it can be sanded to freshen the surface after years of use. Sustainable too, since cork is bark and the tree regrows it.
Biker shorts
High waist, opaque, and they stay up through squats instead of rolling down. These are land gear rather than swimwear, so keep them for the gym and the mat.
One wardrobe instead of two
The point of all of this is not needing a separate drawer for water and a drawer for training. Same leggings for a kite session and a lifting session, rinsed in cool water afterwards and hung to dry.