i'm leaving for a four-month stay in london on wednesday night, and i'm having difficulty deciding what coat to bring. i'm definitely wearing my peacoat, but people keep telling me different things about raincoats and overcoats and trench coats, and i feel like maybe i should invest in something knee-length. do any of the londoners on my flist have advice for choosing a coat that won't make me look like a ridiculous american tourist? should i bring a down jacket, or is it not worth wasting space in my suitcase? why am i even freaking out over something so trivial?