in/at the skirts of the mountain - WordReference Forums

in/at the skirts of the mountain - WordReference Forums

My house is situated in/at the skirts of XY mountain?I live in a neighbourhood located at the foot of XY mountain? 

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I'd say at the foot of, or perhaps in the foothills of, or on the lower slopes of ... though these don't all mean exactly the same thing.
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It seems it's acceptable (though not necessarily common) to say 'skirt [singular] of the mountain'. From the AHD entry for 'skirt':
Skirt [...] 4. An outer edge; a border or margin: a base camp on the skirt of the mountain.