If you want to stay a little warmer, then definitely check out this Dancing Screams Sweatshirt or Pumpkin Embroidered Jumper as they both look super snuggly - plus I feel like you can get away with wearing these outside of October.
For accessories, I also find Etsy is my first port of call. I've mentioned these Maple Leaf Earrings before, but I have to feature them here as well as they're just so Autumnal and pretty. If you're looking for more Halloween accessories, then these Cute Little Ghost Earrings or these Pumpkin Polymer Earrings are great too.
Have you checked out Etsy for Halloween?