Demi Lovato wears this very cute topshop Sheer Sleeved Playsuit on Xfactor US

You can buy this HERE from Topshop for $96. Be quick it's low in stock!

You can buy a similar one, Finderskeepers Buckets of Rain Playsuit HERE for $135 from Shopbop
or this ASOS Shirt Detail Playsuit HERE for $42

Cymphonique Millers wears this pink pleated romper with black buttons and a lace peter pan collar as Kacey Simon on the Nickelodeon TV Series How to Rock. It was really hard to find any similar for this romper so I tried to find dresses as well

The dress in this picture, b + ab Contrast Collar Dress HERE from ASOS for $170.
The most similar i could find is this, Marc by Marc Jacobs Blythe Double Wool Romper HERE from Shopbop for $298
Finders Keepers Let It Rain Playsuit HERE for $100 from Shopbop
Semi-Sheer Pintucked Dress HERE from Forever21 for $22.90