One simply cannot wash one's total personage unless complete nudity is attained, Eliza. I'm thinking specifically though not exclusively, of what I euphemistically refer to as "the undercarriage," which, in my view, can't be effectively cleansed unless the aforesaid area is completely innocent of clothing. To put it less diplomatically, get yer kit off and aim that hose directly at yer underbum. You know it makes sense, and by golly it does yer good...