Welcome to our forum.
I've got a couple of suits that are dedicated to tub use....I only put one on long enough to get into the tub and then toss it on the lip of the tub for use just before exiting. I never wash these suits.....why bother? I think this helps tremedously as the foam is definitely more evident when guests wear their suits in the tub. I've even got a few friends that frequent the tub who bring their own suits that they never wash as well......
Exactly what I do....
Water with low Calcium Hardness tends to foam more.