My belt really needs to be black on the sides for this J.Law recreation to work, it almost looks like a little skin showing through. That unfortunate detail aside, I'm a huge fan of creating a romper with items already in your closet. Black shirt + black shorts or pants = instant romper/jumpsuit that doesn't require getting naked to use the restroom. Have you ever faked a romper?
Top: Banana Republic, $35 (similar, similar)
Shorts: J.Crew Factory, $31
Belt: Limited, $22
Shoes: Forever 21, $37 (similar, similar, similar, flats, flats)
Clutch: Urban Outfitters, $30 (similar)
Necklace: INPINK c/o, $30
Approx. dates: Top and clutch are 4 years ago. Shoes and necklace are 1 year ago. Shorts are recent.