Panty & Stocking WG (パンティ＆ストッキングwithガーターベルト) from Nyantype Magazine Vol. 15, illustrated by (Gurren Lagann, Space Dandy, Evangelion) animator Akemi Hayashi (林 明美). Her art style is SO beautiful, damn !
It was originally included in the December 2013 and 49th issue of Nyantype magazine, and quickly spawned that massive meme where Ryuko is edited into wearing a million other outfits. Crunchyroll even wrote an article about it.
As for whether or not it’s considered “official” art… I can’t say for sure, and have even admitted in the past that I don’t really know how “official” you can count something from a magazine like Nyantype.
That said, considering all the merchandise based around this image…
if you ever see the Yurikuma pinups that appear in Megumi Magazine and NyanType and think “wow this is gross, is the entire anime like this???” just remember that there’s an entire line of official art for Neon Genesis Evangelion where the cast is inexplicably in a western American cowboy setting. Eva is a not a cowboy anime, Yurikuma does not have drooly gross male-gaze makeouts. Watch Yurikuma