SIZE Drop down list for ecommerce site

I have an online clothing store. Developer that put it together can't fix this one feature - Size drop down list in the product page. Different products come in different range of sizes (e.g. some are only offered in Small & Medium, some only in? Large and Xlarge? sizes) but right now all products have the same sizes listed for all of them. I need to be able to control the size? range per product and also need to be able update the sizes based on inventory availability.? Sizes could be either highlighted to indicate availability (see [login to view URL] for example) or not be listed at all if a particular size is not available at the time (see [login to view URL] for example).? Or if you have other suggestions I'd like to hear them. I need this task completed as soon as possible. ## Deliverables I will need to see your portfolio/previous samples of work. Providers w/ ecommerce experience only, preferably those who have done online clothing stores.