Before magadex went dow I was reading a manga about two people. One boy, the designer, and one girl, the model. The boy is poor, he has like four sisters (no incest), his mom’s in the hospital( I think), has longish hair(thing mushroom), and he sews all of his family’s clothes. The girl wants to be a model but is too short. Her dad owns/manages a modeling agency or magazine. She’s a good model, too. The girl wears the guy’s clothes(can’t remember why) in a magazine and people love it. The guy is offered a job but they change their mind because he’s too young but does get a job as someone’s assistant. The girl is given a chance. That’s the first arc
There is an anime about it too. https://myanimelist.net/anime/40392/Runway_de_Waratte?q=runway&cat=anime