Alb is a familiar root to me, as I read occasionaly morning prayer services at my chrch. we are required, to look suitably decorous, to wear a black, ankle-length cassock with a shorter alb (an all white garment, hanging to beteween waist and knees). So I am familiar with the "alb" concept on at keast a monthly basis. It is intended to suggest purity, though the connectkon is purely putative in my case.