It is Chinese size and smaller than the USA size.
Please check the size carefully.
US 3X-Large=China 4X-Large:Length:27.56"(70cm),Bust:51.18"(130cm),Shoulder:19.69"(50cm),Sleeve Length:24.41"(62cm)
US 4X-Large=China 5X-Large:Length:28.35"(72cm),Bust:53.15"(135cm),Shoulder:20.08"(51cm),Sleeve Length:24.80"(63cm)
US 5X-Large=China 6X-Large:Length:29.13"(74cm),Bust:55.12"(140cm),Shoulder:20.47"(52cm),Sleeve Length:25.20"(64cm)
SportsX Mens Stand Collar Pure Color Fashion Denim Jacket Coat - S8UGCHJXJ