Do the Queen and the other members of England's royal family only wear clothes that are custom made, or do they also wear "off the rack" clothes?

Kate, William’s new bride, is famous for wearing off-the-rack clothes as well as desginer clothes.

Yes, they do wear off the rack clothes. Kate has bought a lot of lovely dresses off-the-rack at places like Reiss, Jigsaw, TopShop, Warehouse and is famously known for “recycling” her outfits. That is, she will wear her clothes more than once. I like that about her. I don’t know if she will continue to shop the High Street shops (meaning off-the-rack) as she becomes more and more a fashion icon as designers will simply start sending clothes to her and she won’t ever have to buy another dress again. I am hoping that she will continue to buy some clothes as we all do…it’s pushes up her likeability factor here. The Reiss dress that she wore for her engagement sold out completely and the Reiss dress she wore to meet the Obamas caused the shop internet site to crash.

The Queen also “recycles” her outfits and hats.

I know I saw a picture recently of Harry wearing a Nike polo. Kate is often pictured wearing dresses from Zara.

A bit of both probably. Companies that are employed by the Royal Family on a regular basis are granted a Royal Warrant