More layers, please

I am really loving the layered look with dresses! I tried it this time with a turtleneck, and I love the result, especially with the bubble necklace. Now I'm out of options for layering because I just don't know what else to wear underneath. Any suggestions, dear readers? I've tried button ups, a cowl neck, and now a turtleneck. I've also tried layering over a dress, but I haven't quite perfected that method yet. Dress: Gap (Similar) Sweater: Forever 21 (Similar) Shoes: Tory Burch Eddie Bag: Tory Burch East to West Tote Necklace: eBay I haven't been wearing my bubble necklaces lately and I'd like to change that! They seem to be a big hit with strangers. I'm...