Warning about the feathered headdress: On Argonians, they took away most of the feathers, so there are only some in the front. You might want to preview it on an Argonian before buying.
Don't know how it dyes, though.
- the sort of shoulders on the dress
- that some colours of the dress do not change when you dye (blue parts)
- and the beads on the Tiara can not be dyed
In my experience, the costumes don't dye very well, regardless of the dye rarity.
I bought the river outfit, which is mostly white with a pattern, in the hope it would dye well. It did not.
Then the outfit system was released, making costumes rather pointless to me. The only reason I bought the costume was because craftable armors were ugly.
Thinking more about that Xanmeer robe.... why would anyone who lives in a swamp - let alone someone with a big freakin' tail - wear a relatively tight, ankle-length skirt?