As nouns the difference between gitch and fitch
is that gitch is (saskatchewan) women's or men's underwear while fitch is the (european polecat), mustela putorius or fitch can be (obsolete).
gitch
English
Noun
(Saskatchewan) Women's or men's underwear. fitch
English
Etymology 1
Noun
(fitches)
The (European polecat), Mustela putorius .
The skin of the polecat
Etymology 2
See vetch.