Didn’t find anything about sewing, but according to Google ai (yeah not gonna research since it’s dead of night over here)
The first 3 buttons on a boys uniform for junior high or high school represents someone/have a meaning
1st represents himself, the 2nd represents the person most beloved to you, and the 3rd represents a best friend “and so on”
So idk which one FMC sewed, but if it’s the second one that makes sort of sense? I’m still confused how the boyfriend thought it meant leading on
THANK YOU FOR THE CHAPTER
@Cecey55