As a supplement to the doctrinal and spiritual talk at the beginning of the Confirmation programme, I mention our dress code. For boys, this is easy: jacket and tie, no jeans, no trainers. For girls it is a bit nuanced: dress or skirt, or tailored suit, no mini skirts, discreet makeup (check with mum) careful with the heels. I always thought it was a problem with kneeling down.
Mulier Fortis has helpfully explained the real problem with high-heeled shoes at Confirmation. It's not the kneeling down, you see, but the getting up again, apparently. I'll remember that in the future.
One thing that is really important is to have separate classes for boys and girls. At Confirmation you need to say something about chastity and remote preparation for marriage. It is essential to have different groups for boys and girls for this since they have different "needs" in this respect.