By Hedda T. Schupak, Senior Editor, Fashion What are the most important words to sum up spring/summer ready to wear? Ultrafeminine, pretty, delicate, light, sheer, ornamented, artistic, romantic. The Paris and Milan runway shows went beyond even the extreme of sheer, with bare-breasted models wearing nothing over their skirts and pants except a few necklaces or ribbons and bows. Don’t expect this au naturel idea to carry over to real fashion, but the news is good for jewelry this season. Jewelry is everywhere. Delicate styles with substantial proportions look best now, as do chunky, raw, ethnic pieces juxtaposed against plain jerseys. In necklaces, look either for layers of pale, icy gemstone beads or pearls, achieved with multi-strand torsades, or for long ropes worn triple and quadruple. Another look is the collar with multiple dangles, very Egyptian in feel. Women who prefer sim