Torrent Rain Poncho
I should think a Gore-Tex poncho would be something any amateur sewer worth their Singer could pull off. All you'd need is a big sheet of the stuff (in three-ply laminate form). This can be purchased as sheetgoods at Seattle Fabrics; you can order direct from them, or maybe they can point you in the direction of someone closer to home. In its simplest form, just cut a rectangle, sew the edges, then cut a head-hole in the middle (I'll assume you'll use a rain hat, too). Making one with a hood would be the next reasonable step. Now there's a project for you!
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