Noun, Suru verb, Intransitive verb
seasonal change of clothing; changing one's dress for the season
reading is gikun for 更衣see 更衣see こうい・1
そろそろ衣替えしなくちゃ。I need to start changing my outfit for the new season. renovation; facelift; redesign; redecoration; new appearance; fresh look
Also written 更衣【ころもがえ】、衣更え【ころもがえ】