I hardly know my port from my starboard but I still love all-things-nautical. Think sailor stripes, anchors, navy, red, white and gold, with some rope and boat shoes thrown in for good measure. For your party, have fun with these classic nautical motifs. It doesn't have to (and probably shouldn't) be too literal.
Here are some celebrity outfits to inspire you:
Left: Pippa Middleton's blue blazer and white jeans (seen here) looks like a yacht-worthy outfit to me. I wouldn't really know, but that's what I imagine a stylish sailor might don.
Middle: Eva Longoria's long sleeve stripe top and white shorts (seen here) are so nautical-glam. Her sexy heels make the look more fashionista, less fisherman.
Right: Rachel Bilson's bright red skirt, striped top and navy blazer (seen here) gives a nod to nautical style without treading into costume territory. Totally chic.
Here are 3 outfit ideas using affordable items that will help you get a nautical party look this summer (click on any item for details):