"Boxy jackets" refers to jackets or coats that have a shape resembling a box, with a straight and loose fit rather than a fitted or tailored style. Full definition
Chanel black flat weave wool with satin trim skirt suit from the 1990s... Cropped boxy jacket with jewel neckline, logo buttons at front and cuffs... The jacket is trimmed in wide black s... (1stdibs.com)
This cropped boxy jacket features an off center closure, snaps, and chic chevron quilting. (garnethill.com)
For those twenty something girls who would like to look respectable at the office with adding a decade on their look, this flared skirt teamed with a simple boxy jacket are a pick - me - up set. (creativefashionglee.com)