He went to the flat of one of his schoolfellows and came out, an hour later, irrecognizable, rigged out as an Englishman of thirty, in a brown check suit, with knickerbockers, woolen stockings and a cap, a high-colored complexion and a red wig.
Source: tatoeba (12433990)
The immortal gods are there (quite irrecognizable under these disguises), and also the lowest broken valets.
Source: wiktionary
[T]here remains no trace of their having ever existed—outside of course of the family names which are now preserved, though some of them in an almost irrecognizable form.
Source: wiktionary
The loamy ground on which I lay, the scattered fragments of the cairn beside me, and the rocks and junipers, were irrecognizable as if they had belonged to some other planet than ours.
Source: wiktionary