Please help me find this manga

Hi!
I’m looking for a very specific manga that I can’t remember the name of. Its about a designer (ml) where the fl is the seamstress I guess? She does like the measurements for his designs, togheter they form this team. The story goes that they knew eachother in school, she misunderstood some thing I guess but then he suddenly shows up when they’re young adults, this is when they form a seamstress and designer team. They also form a relationship. The mls siblings (sister and brother) is also models if this help as context, the story also contains smut