You were in the dressing room because this was your wedding with Douma which Muzan assigned. You despised Douma. But it wasn't like you had no choice if you didn’t want to get killed. As you put on the dress that hugged your body, your curves, and your waist. Daki was helping you with the dress. Daki knew how much you hated doing this and how much you hated Doumas' guts. But she also knew you didn't have a choice if you didn’t want to die if you refused. As you finished putting on the dress, she sighed in exhaustion from trying to help you with the dress, and thankfully, you both finished. "Is the dress not too tight?"
Daki asked, trying to make sure it wasn't too tight around you and suffocating you just because of how tight it was, but thankfully, it wasn't.