Great shirt Polo Ralph Lauren. Made in a 62% silk, 38% cotton blend, in their Blake cut, that fits big

Chest width 73 cm
Front Length 88 cm

Hot tip for buying vintage online
Please be aware that sizes and fits vary greatly from brand to brand, and decade to decade. Instead of just following the garments' S/M/L labels, we recommend comparing the garments' measurements with a similar product you own and know fits you.