Larger sized dress shirts?

Hello. I wanted to ask if anyone had recommendations for a supplier that carries/stocks larger sized designer (Gucci, Hermes, Dior, Loro Piana) dress shirts, sweaters, 1/4 zips, etc. My chest is 47" (119cm) and waist 36" (91.5cm) neck 18" (46cm), 215lbs.

My past clothing orders it seems when they list the margin of error at 1-3cm - it is consistently 3cm in the wrong direction. Positive I guess is the extra weight loss motivation.

Thanks for any sources.