We just had a custom closet designed and installed. It's very difficult to get good pictures in a small space but I've done my best. We chose single medium-high hanging racks to keep our clothes above dog/cat height. Apparently if your human isn't in residence, the next best thing is nuzzling their clothes! We also had plenty of space so the single rack system was more than sufficient.
I don't plan on it, but I could give Imelda a run for her money with all my new shoe storage.

This space was designed for packing. The t-shaped counter perfectly accomodates our luggage with space on both sides to queue items to be packed. There's also a valet rod for hanging items.

Of course the more I look at the closet now, the more I want doors on at least some of the shelves. Don't tell Curt though. I was adamant that I didn't want them. I thought then (and still do) that it would make me crazy to have to open a door just to get a t-shirt. It would look nice though.....