I was going to start a thread over in CCC about billowing shower curtains, because I thought I had found a shower design that prevented billowing.
Turns out I was wrong, but, hey, I think I salvaged something from defeat.
See, this shower enclosure has the tub part and the three sides above the tub, and the shower curtain, just like normal. But it has this feature I’ve never seen before: Around the top of the tub, there’s a – for lack of a better vocabulary, let’s call it a “channel” – in the side walls of the enclosure. This channel is about 1/2 inch deep and maybe 2 inches high.
Kind of like this, in cross-section:
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[ . . . . . . . ]
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._____________/
[applause] Oooh, cool! I’ve never succeeded in doing that before (drawing a picture that sort of makes sense on SDMB). 
[/applause]
Okay… I’m done.