I've seen sequined leggings and thought to myself "when would anyone wear those?" --and with some statement jewelry I think they would be perfect with this top!! --But it would be more of a New Year's/clubbing look.
personally i'm not a fan of the long tunic/legging combo. if you're looking for an alternate, i would tuck this into high waisted trousers or even skirt perhaps. also, ankle booties never hurt an outfit (; (okay that might not be true, but it's mostly the case)