Not everyone knows that George Myers, the pharmaceutical whose collection of antique rugs and fiberware is housed in Washington's Textile Museum, also collected ethnic jewelry.Lucky for us - because the museum's gift shop, which has grown from a former closet to a full-size store, carries on the tradition of Myers' collecting. Square in the middle of the room - among the Molas from Panama, embroided wall hangings from Colunbia and Persian needlepoint wool - is a glass case filled with folk and ethnic jewelry just right for this spring's beige-toned, loose-fitting clothes. But you could even keep your old wardrobe, for once you sling a large, vibrant red and blue cloisonne disc hanging froma braided silky cord around your neck ($18), nobody is going to notice what else you're wearing. Brought to you by the People's Republic of China, this ancient art of layering enamel is also worked on small bottles or pierced pendants, suspended on gold chains ($18). Bits of old Chinese blue and white Ming Dynasty pottery are mounted into a bracelet ($45) or necklace ($36). There is even authentic Indian palace jewelry - an intricate belt of coin silver from the turn of the century ($249). Village jewelry from Iran is represented in eighteenth and ninteenth-century carnalian and amrash beads restrung on a new necklace, ($400). or affect your turn art by stringing Turkish glass or amber beads yourself (forty cents to $3). And coin of the realm can be had, too , in the form of Turkish silver coins with attached loops for hanging. Contemporary delights are stickpins for India with brighly enameled bugs, elephants, or flowers ($6). Nothing here is mass-produced or reproduced. All are products of societies where the Industrail Age has not yet taken the human hand from the jeweler's art. The Textile Museum SHop. Textile Museum. 2320 S St. NW. Tuesday through Saturday, 10 a.m. to 5 p.m. 667-0441. Debra Star