Hang the clothes outside all day on a sunny day. The sun and wind will help zap those smells right out of the fabric.
Wash the clothes alone in the washer using detergent that is free of dyes and perfumes. Washing the items alone will not only make sure that the smell gets out of the clothes more thoroughly, it'll also make sure that the smell doesn't spread to the rest of your wardrobe.
Add a cup of white vinegar to the washing machine during the rinse cycle. Don't use colored vinegar of any kind, or you'll end up staining those fabulous clothes of yours.
Wash the clothes again with the unscented detergent, but this time without the vinegar. This is to get the salad dressing smell out of your clothes that the vinegar might have left.
Run the clothes through the dryer with an unscented dryer sheet. Voila! Your clothes should now be fragrance-free. If the scent isn't quite gone all the way, just repeat the process.