Here we finally meet Edgar, in his role as Poor Tom, in all his muddy, half-naked glory. In order to escape his father's misplaced wrath, Edgar has chose to disguise himself as a beggar. That's all well and good, but the lengths to which Edgar goes in his disguise are rather extraordinary. He throws himself whole-heartedly into his part and comes up with HUGE rambling "mad" speeches. I worry about Edgar sometimes.
This scene also features the famous "Off, off, you lendings!" bit where Lear takes off his clothes in the middle of a storm. It's one of the directorial flashpoints of King Lear - just how many clothes does Lear take off? Several acclaimed productions in recent memory, notably Ian Holm's 1997 production and Ian McKellen's 2007 production, have had Lear drop his trousers in a most emphatic and thorough manner, revealing literally all to the elements.
I was fortunate enough to see Ian McKellen perform Lear while on tour in Singapore. For better or worse, nudity on the stage was not permitted, and thus I never got to see Sir Ian's bare, forked animal.