The thing about fougeres and chypres is that the notes that are essential generate a kind of harmony, similar to something like a fifth in music. The fougere requires lavender and tonka/coumarin, whereas the chypre requires bergamot, labdanum, and oakmoss. A frag could start out as a fougere and then have a chypre base, which I don't think is all that uncommon. Usually, fougeres created in the last 40 years or so have notes like a citrus on top, geranium in the middle, some spice in the top and/or middle, and oakmoss in the base, with a few other notes that sometimes show up. It's really the creamy lavender/tonka accord that is the "signature" of this kind of frag. Combine lavender with vanilla, for example, and you've got something that smells quite different, though tonka is often mistaken for vanilla by newbies.
As to GIT, fragrantica gives the notes as: "Top notes are iris and lemon verbena; middle notes are violet, vetiver and basil; base notes are amber and vanilla and cedar." If so, this is not a fougere at all (I tried it long ago as a newbie and hated it, so I haven't thought much about it since; I dislike violet leaf).