I ordered every thing from Vintage Trailer Supply:
I used this small curtain track
At first I didn't see how I was going to get it to bend in both directions, but it just took slow and steady work from two people.
These small curtain sliders
And the shower curtain rings (that look like binder rings) from Bed, Bath & Beyond.
And you'll need these end stops
I used one right after the first/highest curtain slider to keep it from falling down. I used another at the very end of my track by the mirror to keep the curtain from falling off when it's closed.
I still need to make some kind of tie-back to keep the curtain open.