I purchased this new and wore it once for my son's graduation ceremony (^^) The lining is checkered, so it's cute even if you fold up the sleeves ☺︎ I think it can be used for both casual and formal occasions. I'm not sure about the size, but my son was able to wear it with the sleeves folded up when he was wearing size 120 clothes (^^) Please understand that this is a used item and has been stored at home (^-^)