Where can I find the apron/towel worn by the America's Test Kitchen staff? On America's Test Kitchen, I've seen them wearing a towel around their waist that is somehow attached to an apron.  Is there a name for this?  Or are they just somehow tucking the towel into a standard apron pocket?

This would be a great kitchen convenience--where can I buy an apron like this?  (Preferably only covering below the waist as shown on Becky below.)
The traditional butcher's apron tie is to wrap the strings of the apron around behind one's back, then back to the front to tie.  This provides a convenient place to put a tea towel or rag.

From the photos, this appears to be what the folks in the picture have done (Becky and Chris, IIRC).  When I worked in a deli on Long Island, this is how we tied our aprons.