Girl group Rainbow revealed their interesting stage outfits for their comeback.

Yesterday, Rainbow held their showcase in Seoul and performed their new title song, "Tell Me Tell me." Their outfits revealed their stomachs and had ruffles that resembled a curtain. Many fans agreed that the outfits were strange yet sexy. 

Fans are now calling this outfit the 'Curtain Belly Tee' as it reveals a bit of sexy and lovely all at once.

They also wore slim and tight blue jeans to complete the entire look. The jeans were plain and simple so as not to take away from the fun top.

Unlike their other heavy dance songs, this song reveals a lighter and fun sound.