If I'm not mistaken that's a four-button hacking jacket - lovely jacket nevertheless. Some mod suits in the earlier 60s did have 4 buttons. The jacket is a Hacking jacket worn when riding a horse, this is where the slanted pockets come from, as it would be easy to get into the pockets when in the saddle. The Mod suit was influenced by the Italian look, padded wider shoulders, short jacket, two, to three button, Trousers would be narrow and flat fronted. their are a few pics of the Kray Twins in suits which gives one a idea. The Skinhead suit would be long down to thumb tips, Three slanted pockets, narrow lapels, narrow shoulders, 3 button, well waisted , one rear vent 12ins and longer, four buttons on sleeves. Trousers would be 18,to 18.5 parallel , Ticket pocket right front, and flapped, two rear pockets also flapped, Around our way.. we had creases finishing into pleats turned inwards, with a dart each side, Length would be above the ankle. The waist had zipped side a justers. Materials would be Mohair, Mohair Tonik, Prince of Wales check, and Dog tooth. To me Teds was the Original Skinheads, Working Class.