Except that I think they wouldn't just be like glamering over a particle effect only...if we still had an image of the Robe of Winter Ice, you can see that it's an integrated outfit.
It looks like a robe with ice crystals growing out of it, and sort of frozen all over (if I recall correctly). So, yes and no; I'd like effects to overlay on cosmetic outfits/helms/goggles/trinkets, sure. But what I was asking for also holistically looks themed for elements, etc.