Hi Novice maybe its late but this is my advice (I own a web site about deb balls, debutanteball.com) - The dress is a full length ball gown, formal: sleeveless, wide skirted, ankle length or floor length, allowing dance and waltz. You have one or more slips as underwear, to give fullnes to the skirt. You have to train how to lift the side of the gown while walking, dancing, sitting ... If you are not in the Opening comittee, the gown must not be white.
You should cover your arms with over the elbow gloves.
Pumps or sandals, matching the gown ,with medium high heels, typically dance pumps.
Please ask me more if yoy need something ! alt200@wanadoo.fr
Anne !