It was obviously worn and has some discolouration and staining to the lower leg and other areas. White milk spots possibly from salt on the roads in winter time. There is a small tear in one of the sleeves and the zip toggle is broken.
It could do with being professionally cleaned. There doesn't appear to be any labels that indicate the size, so I can only give my best guesstimate. By today's standard it's probably at least a medium, and closer to large. Certainly bigger than medium, but not necessarily extra large. So, if I had to state one size category, I would probably settle for large , but that's just my opinion.
Please see pics to assess the overall condition. Judging by the weight and size of this item, the best way to send it seems to be. Thank you kindly for looking. The item "Vintage Belstaff Black Prince Motorcycle Jacket & Trouser Suit 1950s Original" is in sale since Friday, November 16, 2018. This item is in the category "Clothes, Shoes & Accessories\Vintage Clothing & Accessories\Men's Vintage Clothing\Coats & Jackets".
The seller is "pussikmoosik" and is located in Brechin. This item can be shipped to United Kingdom.