Cardigan and button-down, J.Crew. Skirt, Banana Republic. Scarf, Brooks Brothers. Belt, vintage+mom's. Flats, Geox.
Common mistake #1: IT'S vs. ITS
I see this everywhere. A coat's description will include "it's polyester lining." Now, before you recoil at the thought of polyester, recoil at it's first. IT'S is always a contraction of IT IS and although that sneaky apostrophe conjures up the idea of possession (see: John's hooker, Jane's dough), do not fall for it. "Its polyester lining" may not necessarily make me buy the coat, but at least I will know that the owners of that business care enough about their image to have hired a proofreader.
I realize that some of you may be rolling your eyes right now and I know all about DUH! I also know that even though we may be aware of the rules, we still make mistakes or often forget which is which. Ergo, I propose that you think about it this way. You know ITS, as a word, exists. And you know that the plural of IT is not ITS (that would be madness!). So that can only mean one thing: ITS is a possessive adjective, alongside my, your, his/her, our, and their.
I'm glad I got that off my chest, readers. Now if you'll excuse me, I have a cashmere sweater to hand-wash. In other words, it's time for its bath.