Vanessa Hudgens Instagrammed THIS photo.
Her hat is the Lack of Color Wave Green Terry Bucket Hat. Buy it here: LACK OF COLOR
She is wearing sunglasses that are similar to the Ray-Ban RB3447 Icons Mirrored Sunglasses which you can buy here: RAY-BAN, SHOPBOP, and SAKS FIFTH AVENUE
Her bikini top is the Frankies Bikinis Nicola Top. Buy it here: FRANKIES BIKINIS
Her bikini bottoms are the Frankies Bikinis Nicola Bottoms. Buy them here: FRANKIES BIKINIS
Her pool float is the Funboy Butterfly Pool Float. Buy it here: NORDSTROM