Amazon already sells a hell of a lot of clothing. I buy more stuff from them than anywhere else, actually.
I've even bought a couple of suits from them, and they were fine. It's not a problem as long as you measure carefully and plan on getting some alterations/hemming done locally (as you would with any off-the-rack suit).
Hey, that might be an idea. Amazon sends around someone to measure you, then you get a bespoke, tailor-made suit delivered in a week or so. Take that, Savile Row. :-)
Furniture could be handled with a good VR system -- something that lets you take a few dozen pictures of your living room from different angles, synthesizes a 3D model, and then lets you put a virtual piece of furniture in there.