No raised heels or flip flops. Running shoes work well as long as the soles are clean.
It can be cold on the ice, so dress in layers and bringing a light jacket. Gloves and thick socks can also help.
Pants that offer easy movement are important as you will be required to stretch and get into positions that tight pants and jeans are not necessarily appropriate for.
All particpants going on the ice will need to sign a waiver. Minors will need a parent/guardian to sign a waiver for them.