"Boyfriend style" refers to clothing or fashion items that are designed or styled in a way that resembles clothing typically associated with men or a man's wardrobe. Full definition
I added a white boyfriend style blazer to cover up for the over air conditioned office. (northwestblonde.com)
A casual look of ripped boyfriend style jeans, plain tee and blazer is shouting out for something stylish yet comfortable to finish off the look. (thestore.com)