without having or being given a chance to change clothes: (just) as one was
in what one had on (was wearing).
Войдя к себе, он бросился на диван, так, как был (Достоевский 3). Entering his room, he threw himself on his couch as he was (3a).
Разбудили нас Чудаков и Евдощук. Они, как были, в шапках и тулупах, грохотали сапогами по настилу, вытаскивали свои чемоданы и орали: «Подъём!» (Аксёнов 1). Chudakov and Yevdoshchuk woke us up. Just as they were, in their hats and sheepskins, their boots clumping on the floorboards, they pulled out their suitcases and roared: "Rise and shine!" (1a).