Would a “Big Kids” jacket fit a man if I bought an XL or L size?
It is possible. Depending on the maker, Big Kid size ‘Large’ for example, is constructed to accommodate an individual between 5 foot 2 inches and 5 foot 5 inches in height weighing anywhere from 100 to 150 pounds. And ‘Extra Large’ might accommodate an individual up to 5 foot 10 inches in height and approximately 175 pounds. But these are just estimates. It would be advisable to contact the seller for sizing information specific to the item you wish to buy and/or to study the ‘return and exchange’ information carefully.