Permalinks and Subdomains

Hello,

I am migrating a website to Wordpress. The website has various categories (shirts, pants, jackets) and each category is using its own subdomain. For example:

shirts.domain.com
pants.domain.com
jacket.domain.com

I am looking for a way to duplicate the same URL structure using a combination of Wordpress's permalinks and mod rewrites. I am not yet sure the best way to implement this.

Any advice or suggestions?