Details, Size & Fit. The Wool Window Waistcoat by Jack London is a picture-perfect addition to The Blue Window Mod Suit. Add a waistcoat for a polished look. Suitable for The office or any formal occasion. Our Model wears a size 50. He is 6’2’’ (189cm) tall, with a 77.5cm waist and 104cm chest. 5 Button Closure Adjustable Buckle Cinch Strap Two Jetted Pockets Dry Clean Only.Material: 96% Wool, 4% Polyester.SKU: JA108AA18YMV.