Originally Posted by
sometimes_miss
Perhaps a moderate sized briefcase with a combination lock on it? You could at least store maybe bra, panties, camisole which could easily be transferred to something else should you want to go to a more 'public' place of the house to pull out some other item from the briefcase so they wouldn't suspect that you're storing anything unusual in there. Do you have a laptop? One that would fit into the briefcase? That would work, because you could always leave the laptop out when you're storing the clothes. Anyone trying to look into the briefcase and mention that it's locked you'd have to ask, 'why are you trying to get into my briefcase?'.
Way back when I lived at home with my parents, I had purchased a set of luggage with combination locks (Samsonite) and kept my stuff in the attic (but I don't know if you have an attic, basement or any storage spots to keep that in), where as under the bed is a common spot. Some people even hollow out the bottom of the box spring of the bed and store things there, attaching the lower part of cloth with velcro.
If you do have an attic or basement with suspended ceiling or wood plank floors, those are also hiding place options.