I tried this French Connection jumpsuit yesterday and I loved it. You would definitely need to layer it at the moment or you would freeze. I found the perfect little Miss Selfridge cropped grey sweatshirt which worked so well.
The shoes to complete the outfit would be Kurt Geiger Lowdown brogues, my current obsession.
French Connection Jumpsuit in Mango Red £100 here
Miss Selfridge Cropped Sweatshirt £20 here
Carvela Kurt Geiger Lowdown £130 here