picture (someone or something) in(side) (of) (something)
To create an image in one's mind of someone or something being inside of something else, such as clothes, an enclosed space, a location, etc. Picture these sofas inside our living room—wouldn't they just be perfect? The old advice for public speaking is to picture the audience in their underwear, but I don't think that really helps. Picturing myself inside of an office building for eight hours a day makes my stomach turn.
picture someone in something
1. to form a mental picture of someone wearing something. I can just picture Tony in that baseball uniform. Can you picture yourself in a dress like this?
2. to form a mental picture of someone inside something or some place. I can just picture you in that car! Can you picture yourself in jail?