It must be noted that, though he lived much at Port Royal, and partly at least observed its rule, he never actually became one of its famous solitaries.
In the first of his Dialogues (fair models of Cicero), Severus puts into the mouth of an interlocutor (Posthumianus) a pleasing description of the life of coenobites and solitaries in the deserts bordering on Egypt.
This site offers a selection of traditional solitaries with various cuts.