minigonna inguinale


Hello everyone.
I was reading an Italian fumetti called Julia and I ran across what I believe to be an expression that I do not understand.
After looking at a secret video where a voluptuous woman is seducing a man, one of the policemen makes a comment: "mhm, minigonna inguinale!..."
I understand the first word to be mini-skirt but ' inguinale ' doesn't even appear in wordreference except to describe something to do with the crotch area.
Can someone help me make sense of these two words together?
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