Don't worry Tuuli, you'll get to deal with clothings of higher class than priestess's robe.
Although
Her main specialty ends up being the hairpin.
As for Myne...
Embroidering magic circles into the spouse's cape is a pretty standard duty of a wife, so practicing embroidery is a common bridal training.
Except she's terrible at it so she just sorta cheat by using her special ink to just draw magic circles and have her attendant embroiders the magic circle on top to fake it.
I really do miss Myne OG outfit from when she was young, it's really a staple for me. (I don't think this is a spoiler but I'll still mark it as such.)