I am taking my DD12 for a 3 day trip next week and we will be attending MNSSHP for the first time. Does anyone have any ideas for a simple costume so we won't be too hot or too uncomfortable? We were going to just wear halloween t-shirts but I thought it would be more fun for her to dress up but since we are only going for 3 days I would like to pack light also. Any ideas would be appreciated!!