Dog coat large (but not really large)

I got this great dog coat from a reputable company (Lele Pet), but… It just doesn’t quite fit my dog‘s body shape. It says that it’s large, but I don’t know. Feels more like medium. That said, great colour, reflective piping, warm fleece on the inside. Just what your dog needs for winter. (the price is firm; I paid $60 for it, and it’s never been used)