Uh, this may be a bit stupid of me to ask, but...
Is she not wearing panties under the yukata? I mean, I've heard you don't wear underwear with one, but I assumed that was a joke.
It's not a problem, as it makes the scene more adorable in my opinion. It's just makes me realize I've been wearing them wrong if this is actually a thing.
Also, finally a really cute confession! I'm so happy!