Selena Gomez Outfits

photoshoot with The Daily Mail

Alice + Olivia Skyler Flouce Romper – $198 [exact]

photoshoot with UK news site Mirror

Miss Selfridge Light Tie Waist Chambray Shirt – £28.00 [exact]

New Look Idol Twisted Chain Necklace – £15.00 [exact ?]

photoshoot with UK news site Mirror

Giant Vintage Cartoon Pink Sunglasses – $12 [exact]

A|Wear White Mesh Spot Skirt – £35 [similar]

Schuh Rambo 5 Buckle Wedge Boots – £79.99 [exact]

Selena Gomez on the Spanish TV show El Hormiguero

Alice + Olivia Maggie Strapless Sequin Dress with Draped Skirt in Stone – $484 [exact]

also available here and here

for a cheaper alternative, you can get this look with a tube top and a skirt:
Kimchi Blue Soft Drape Skirt – $29.99
Forever 21 Smocked Foil Tube Top – $14.80