Nudists enjoy recreating in the buff -- anything from wave surfing and volleyball to bird watching. If you fall into this category, you may delight in throwing yourself a birthday suit birthday party so you and your friends can frolic, sans clothing, before you blow out the candles.
Save it for the nudist colony. The truth is the mere thought of someone's nether regions being near a tub of ice cream is enough to make even the most open-minded person shudder in horror. For birthday parties, it's a best practice to keep everyone fully clothed.