He was dressed in blue.
Kare wa aoi fuku o kiteita.
he; him; his; boyfriend
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
blue; green; pale; unripe; inexperienced
clothes (esp. Western clothes); counter for doses of medicine, gulps of tea, drags of a cigarette, etc.
indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.
to wear (in modern Japanese, from the shoulders down); to put on; to bear (guilt, etc.)