A look at their fashion!
These are based on the few non-school outfits we see them in across the series, whether that's the manga, anime, official art, mobile game etc.
Terasaka’s fashion is characterised by loosely fitting clothes overall, but not by too much, to give the impression of him being bigger than he is. In summer, he is shown to be wearing floral button-up shirts (“Hawai’ian” shirts) and otherwise is shown to be wearing big hoodies and jackets. Dragon patterns feature in two of the five occasions we have of him in casual clothes, so it feels safe to infer he finds those graphics cool and fitting of his image.
Hazama’s fashion is canonically referred to with the Japanese word for goth subculture, “ゴス”, on two occasions. Once in Irina’s “fashion check” in Hazama’s profile and again in the mobile game for one of her cards. Based on the outfits we see from her, she specifically leans towards the “Victorian goth” and “Romantic goth” styles, which suits her other interests such as in the literature of that era (EG The Count of Monte Cristo) and her witchy image. Said styles feature lots of corsets, waistcoats, lace shirts and dresses, ETC. Otherwise, she predominantly wears black (even in the summer, as in the manga she changes from her shirt and skirt into a black tank top and shorts after the assassination attempt) which is another staple of the goth subculture.
Muramatsu’s fashion is characterised by dark clothing, graphic tees and jewellery. He’s depicted in chain necklaces particularly, but also wears rings on a few occasions and has also been shown wearing garter belts and armlets. He largely wears shirts with noticeable patterns or typography on them (both “menacing” patterns like skulls and general words in cool fonts like his “spicy” shirt during summer) and they’re usually black or dark in colour. Overall, how he dresses intends to convey the idea of a delinquent.
Leather jackets are the staple of Yoshida’s fashion. His overall clothing is described as “streetwear” and the jackets undoubtedly do most of the heavy lifting. Yoshida is conscious of his fashion and makes an effort to appear stylish, so he puts more effort into his outfits than, say, Terasaka and Muramatsu. He wears collared shirts, loose tees, and non-leather (usually) dark jackets too. Other accessories include belts, pendant necklaces, and biking gloves.
There are two defining characteristics of Itona’s fashion: turtlenecks and hoodies. Often at the same time. He prioritises comfort and practicality over style. He even wears turtlenecks during the summer and other clothes, such as his winter coat, cover his neck. He also wears gloves and wrist braces and, of course, his bandana.