i love that fashion has embodied this casual yet glam look. especially for the holidays. i remember being younger being so uncomfortable in my Christmas Eve outfit. Unbearably. itchy. tights. Now, you can put on a pair of (nicer) leggings, comfy (but not frumpy!) sweater, and fab flats. pick a statement necklace and BOOM. you look good and feel good.
ps- you need lots of stretch and flexibility for opening presents!