*The video is the same with 'Overshirt 1' but has additional instruction for back box pleat.
Rereference: Myanderthal - Collar Lettering Shirt Jacket

Bodice and sleeve: Aldrich flat shirt block.
Collar: Aldrich 'shaped shirt collar with stand'
Sleeve shirt cuff instruction: loosely base on Myoungok two pleats shirt cuff.
Fabric: woven, heavy twill
Detailing: breast pocket, decorative flap, side welt pocket, tag, arm pocket, back box pleat, waistband hem.
Issue: As usual, one-piece sleeve creates excessive fold at front upper arm. Next time will try with smaller armhole, probably with more dropped shoulder.