You can purchase black pants for football officials from Gerry Davis Sports (Appleton, Wisconsin). Although they do not have the information up on their web site yet (they are a brand new product) they will soon. They have belt loops for a standard football officials belt, white stripe that runs the length of the pants, they come in even waist sizes 30 to 50, they have an expansion waistband – located on both sides of the pants - which allows the official to adjust the waist according to the amount of layers of clothing they are wearing, two front pockets, two back pockets; one with a buttoned flap and an additional, smaller front pocket designed for placement of your penalty flag. Their web site is
www.gerrydavis.com; their phone number is 800.916.9088. If you send them an e-mail they can send you pictures of the pants so you can see what they look like before you order them.
Hope this helps!