Dress in a way that will make you comfortable. The sea urchin question asks you what is the reason for membrane changes in a sea urchin egg when fertilized by one sperm or something like that.
If dressing up helps you perform better on tests then I would go for it, otherwise go casual because the last thing you want to worry about is losing circulation to your brain because your tie is to tight!
I was hoping to get the sea urchin question because everyone has talked about it so much, but I took the DAT on Saturday and saw nothing regarding the urchin. 😡