Demi Lovato Tweeted THIS photo.

She is wearing the Helmut Lang Belted Leather Jumpsuit. Buy it here: HELMUT LANG, NET-A-PORTER, NORDSTROM, and SAKS FIFTH AVENUE
Here are some more affordable and faux leather options:
#DemiLovato #leather #jumpsuit #leatherjumpsuit #DemiDWTD #HelmutLang