I think it depends on what kind of party it is. If it is a party between friends, for example to celebrate someone's birthday, I think it will be alright to dress hot or eye-catchingly. You know, just to have fun. But if there is people from different age groups participating in the party, it will be better to dress a little bit formal, and to show your respect to the occasion.
adj. 合适的,适宜的
adv. 合适