Kon tragically cannot sew, or he'd eventually modify the Cepheus uniform, but for now he tends not to wear the shirt that goes under the tabbard most of the time, and switches out with that when he needs to wash. He also probably tends not to wear the sash as a belt, either forgoing it or just throwing it over his shoulders if he wants it.
ALSO I have a ton of icons where Kon is using both hands but that is INACCURATE, he is only able to use his left hand. He keeps his right arm tucked into the loose sleeve.
He has not been around long enough for his hair to turn into some wild mane.
Link wears his uniform done up most of the time when he's around other people--shirt buttoned all the way up and tie tightened. His coat may be buttoned or unbuttoned though. He forgoes the coat, tie, and buttoning all the way when he is in his dorms and may even have his sleeves rolled up to his elbows if he's doing kitchen work.
Link keeps his hair trimmed and braided the way it is in his icons most of the time in public. He'll leave it loose to dry or put it in a simple ponytail when he's just in the dorms for the day.