i redid riddle's dorm uniform for a twst in time (as compared to this) thanks to a comment by @idol-fan-eve and the realization that riddle "how much do the teachers care about dress code for our clubwear?" clover would be a little more creative with his personalization. (lilia is his personal hero in this regard. and malleus is his hero for letting him use the old, unmendable dorm uniforms for fabric, which is also where the skirt in his clubwear came from. i should design all the garments he made with that stock...) just pretend the old design is how his uniform looked before he completely overhauled the lower half of the coat.
also the stripes are meant to resemble both the QoH's dress (the black and yellow) as well as, very loosely, a dragon's belly scales. also he's wearing shorts and tights. because he can. i wasn't lying about lilia being his personal hero lol and also i gave him another hobby! because why say "hobbies" and then only give them one? also also no hat because growing antlers are actually incredibly sensitive, unlike after they stop growing. malleus doesn't wear a hat either (because horns, which are canonically "packed with nerves") so i say riddle doesn't have to.