Puff Shoulder Leather Jacket

Super cool leather jacket by River Island. It’s almost like a stylized bomber jacket married moto jacket and had a bad ass rock n roll daughter jacket. I want to keep this and listen to The Runaways at 11, but it’s too small! Hoping someone else can give it the life it deserves. Says size but fits like a 4 or 6. Maybe 8 is uk size?