For a party, I really go for it and pick a sheer catsuit or a lace catsuit. At kinky parties, they wouldn't let you in wearing a catsuit like that because of the fabric, so then I would go for a vinyl catsuit. I also wore this catsuit to a dress-up party recently. I was dressed as Catwoman. It was a more than excellent night... ;)
I, myself am a big fan of catsuits. Not only during the day, but also in the evening. Outside or in. It gives more length to my legs, my curves are emphasized ánd I only need to add a pair of matching heels and my outfit is complete. Wonderful simplicity (or is it just laziness? ;)). A catsuit is also instantly sexy. At business meetings, I will usually wear these kind of catsuits from LaDress. They are always a good idea.