FYI be very careful with the Crochet style boots; my friend works in Nordstrom shoes and she said a lot of them come back because they snag and pull, just like a sweater will if it grabs onto something.
Personally I only wear Uggs during cold weather in my house, and something about wearing a sweater on my feet seems a bit silly. Since I live in California, I'm only a fan of Uggs when they're worn for practical reasons; I hate stepping onto campus and seeing girls wearing winter warmth items as accessories. It makes no sense to wear a scarf and uggs over a midriff baring tubetop and a mini. Not only does it make no sense, but it's fuckin' ugly.