Have a pair of angled hanging rails with pins/stops/loops on it (like some clothes shops) mounted to the ceiling, either with a gap in the middle to access the clothes, or back to back and accessed from either side.
Tall stuff at the front, short stuff at the back.
Probably all sorts of stuff you could use as rail, 21mm uni-strut slotted channel, tensioned chain, just saw you can pay £60 for an angled hanging rail with a spring stretched over it to hold your hangers too.
Obviously you’d need to check the hangers will hook on and off nicely without jamming them under the ceiling!
You could also put a low rail across the back and hang those box organiser things that are designed for t-shirts and shoes…and they will hide entrance to the secret room 🙂