Most common is the so-called "Congo" parka, it has only two frontal external pockets, three buttons at the collar for a detachable hood and internal buttons for a winter liner:
Next is the parachutist style jacket, which is has a permanent hood sewn into the collar area, a chest pocket on the right and a rear lower pocket fastened with two snaps. Internally, it has one chest pocket and two lower pockets, all closed with a single button. Also features an elasticized waist cord with two knobs that can be clasped together:
Finally, the para jacket with removable hood. This has an external chest pocket on the left side and a rear lower pocket on the right, closed with a single button. Internally, 1 righjt chest pocket and two lower ones, single-button closure. Internal bungee cord and a wide band which goes around the waist and can be secured with 2 wooden knobs:
Hope this helps.