Found whilst looking for something else, this jacket hadn't seen much attention for quiet a few years. From what I can tell it's probably from the 1980's and made by TT Leathers up in Barnard Castle, Northumberland.

Dark green heavy waxed cotton canvas. The wax had completely dried out so this jacket has been thoroughly washed to remove the old wax and freshen up the tartan cotton liner. It's then been re-waxed using an Otter Wax fabric wax bar. It has responded really well to the re-waxing and looks set for use on the bike again.

Quilted shoulder and elbow pads - four large front pockets. Belt loops but original belt is missing. Couple of small wear marks on cuffs but nothing I'd describe as serious.

Sizing wise its labelled as 102cm or 40'. I'd call this a Medium or possibly a Small.