Dressed as a girl on a cruise?

I went on a cruise recently with my family and 2 other families that we are friends with each other family has a daughter my age and i have a younger brother and sister. We arrived in Cozumel and i did not feel like getting of the ship of the 7 am to 4 pm excursion my family and the other two had planed. me and the two daughters stayed behind. they wanted to go hand out by the pool and asked me to come by that morning and help them pick what to wear. when i got there they through me on the bed and gave me a white bikini and told me to put it on. i don't know why but i did and then the started braiding by hair and then held me down to put mascara and lip gloss on me. they took pics and told me to come with them up to the pool and if not they would show the families. i did as they said but not before they made me shave my body. i felt defeated. from then on they made me dress like a girl with them every day our families got off the boat. when we got back home from the cruise today they called me and told me to get on yahoo answers and ask what i should have to wear to dress as a girl for the last time and it has to be girly or they will show my friends the pics. what should i have to wear from shoes to hair and makeup and it can be any style( beachy or formal or sporty)