A casual party in my opinion should be a comfortable one. So wear whatever you think suits you best. A semi-formal set of clothes should be enough to make one look glamorous and definitely not out of place.(For girls- A fancy top with some shimmering dust together with a pair of jeans)(For guys- A three-quarter sleeve top [without prints I’d suggest] and a pair of dark-cloured pants probably)
Of course some make-up for girls would be perfect.
Guys definitely should style their hair for the occasion.
I do think that girls should go for a naughty look and guys a cool look! Anyway, no matter what occasion it is, or what you wear, add a little confidence to perfect things! Just be yourself and try to enjoy the evening. Add to the fun, don’t stay out of it.
Shine from inside out