Your, pron. (second person possessive used as an adjective)
You’re, contraction of “you are”
Yore, n. time past
I’m not sure your bell-bottoms fit the “Days of Yore” theme, but if you’re comfortable, that’s all that matters.
You’ll, contraction of “you will”
Yule, n. Christmas or the Christmas season
If you don’t finish your homework, you’ll have to miss the Yule party.