Depends on your body build, style and vibe tbh.
I have a friend in mind, petite, skinny, bold haircut, piercings, wears loud colors, heels. If she was the one wearing this, literally with black leggings and tight black top - this jacket looks amazing!!!
Another friend in mind, quiet, shy, always the same shoulder length hair, undyed, not styled, minimal jewellery, dull colored clothes (brown, navy, black combos), shapeless clothes. If she was the one wearing this it would look 'try hard', out of place and yes even childish...
The jacket is actually pretty great, a lot of potential :) The vibe depends on the owner!