The latest revised edition of the Oxford English Dictionary (well, actually the Concise version) officially included Jeggings and Mankini in the English Language. Both styles were made popular in 2009 so I guess even after two years they’re not going anywhere, huh? Just in case: (photos via 1, 2)
Jeggings: pl. n. tight-fitting stretch trousers for women, styled to resemble a pair of denim jeans.
Mankini: n. (pl mankinis) a brief one-piece bathing garment for men, with a T-back.