Like Marv said, everything we own is in the 5er. Luckily neither one of us is a "clothes hound", so we really don't have that much to worry about.
The clothes we wear most, i.e., shorts, T's, light pants, shirts are either in the dresser drawers or hanging up. The few heavier sweaters, sweat shirts, etc. are in the overhead cabinets in the bedroom. We have our light jackets hanging in the entrance closet next to the front door, and our heavier coats, jeans and few dress items are hanging in the bedroom closet. The only thing we added was a plastic, three drawer storage bin from Walmart, just inside the mirrored closet door to the right (in the new units it's where the louvered W/D doors are), that holds socks, some more shirts and underwear...and that's all we own.
Really haven't found a need for more, as most times we're not in cold weather, so it's a moot point. We really don't have what you'd call seasonal clothes anymore.
As for the suitcase...we bought a fabric, collapsable one from Walmart for $10...folds down to an inch and a half thick, and about 10''x10" and sits on the shelf in the closet until needed.