That's what I found in my Oxford Superlex

saya:
1 nombre femenino (falda) skirt.
2 nombre femenino (enagua) petticoat.

manta:
calico, coarse cotton cloth;
(poncho) poncho.

With no small interest, Captain Delano continued to watch her- a proceeding not much facilitated by the vapours partly mantling the hull, through which the far matin light from her cabin streamed equivocally enough; much like the sun-by this time crescented on the rim of the horizon, and apparently, in company with the strange ship, entering the harbour- which,wimpled by the same low, creeping clouds, showed not unlike a Lima intriguante's one sinister eye peering across the Plaza from the Indian loop-hole of her dusk saya-y-manta.

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Note added at 2002-09-13 02:26:26 (GMT)
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So. although i dont have a translation, i dont think petticoat and poncho covers the case. Anyone?