About to buy a navy parka by LTS. Am 5'9 and size between a 12 & 14. If LTS runs large I don't want to order a 14 and have it hanging off me, but similarly don't want to order a 12 and have it too tight over a jumper. Really don't want to order both and send one back and no real clues in the reviews for this. Any advice/experience pls?