Style Verdict: Comfort or Fashion?

The Simmons sisters were spotted out this weekend in NYC in some very comfortable looking outfits...

Warm fuzzy Ugg boots were in full effect, as were stretchy tights and down jackets.
I'm personally a subscriber to Fabulosity Law # 10, "Dress like you might run into your worst enemy," meaning the most comfy I'll go are Tory Burch ballet slippers or Miss Sixty flat leather boots with jeans and a sweater.
But what about you guys? If you're relaxing on the weekend, do you make an effort or just say 'eff it'?