There are no specific traditions concerning special clothing for Hanukkah.
There is no special clothing worn. It depends on the family and what type of party (if any) is being held.
No.
While Hanukkah is a religious Jewish occasion with special blessings and added prayers, it has no special clothing associated with it. Some families like to dress up in the evenings, for the candle lighting, but most families do not.
There are no particular clothing requirements for Hanukkah in Jewish law. Whatever is acceptable for the rest of the year is good for Hanukkah too. Hanukkah is not one of the major Jewish festivals.
One could dress formally, but there are no specific requirements for Hanukkah concerning clothing.
There are no special clothes worn during Channukah.
shorts and mostly bikinis
No. Costumes are worn on Purim, which is in the spring.
There are no special clothes worn on Hanukkah. It depends on the family custom as to how much the family dresses up.
you have to wear a leotard
A vest is a type of clothing. Vestments are clothing worn by clergy during a ceremony.
Dressy clothes.