Synonyms for Panties:

n.

underwear, briefs, undies. clothing (noun)
dinner jacket, hat, blazer, trimming, evening gown, bowler, burnoose, shorts, t-shirt, caftan, dress, nightgown, cloak, afghan, chemise, garment, ensemble, coat, shawl, jersey, halter, pillbox, costume, petticoat, habit, turtle-neck, bonnet, gown, raincoat, sports coat, homburg, beret, tuxedo, slacks, clothes, skirt, camisole, kimono, pyjamas, fedora, cape, shoes, wrap, topcoat, mackintosh, headdress, shirt, housecoat, pea coat, pull over, robe, pinafore, vesture, corset, poncho, sweater, bathrobe, clothing, boot, frock, windbreaker, blue jeans, tunic, raiment, duds, smock, smoking jacket, overcoat, trousers, fez, brassiere, doublet, pants, greatcoat, chapeau, ulster, blouse, attire, parka, sarong, stetson, trench coat, kilt, v neck, wrapper, jacket, dressing gown, jumper, vestment, apparel, pajamas, fur, slicker, footgear, stockings, outfit, crinoline, array, scarf, sweat suit, garb, sweat shirt, suit, sari.
clothing (plural) (noun)
gowns, camisoles, pea coats, sports coats, suits, apparels, trimmings, Afghans, Scarves, halters, skirts, Boots, nightgowns, outfits, Stetsons, bathrobes, cloaks, blazers, caftans, chemises, shirts, dresses, crinolines, pull-overs, Habits, garments, furs, turtle-necks, garbs, blouses, raincoats, Doublets, robes, slickers, tunics, bowlers, bonnets, sweaters, kimonos, evening gowns, brassieres, pillboxes, berets, mackintoshes, trench coats, ensembles, kilts, overcoats, shawls, smoking jackets, vestures, sarongs, burnooses, sweat shirts, saris, topcoats, wraps, dressing gowns, Jerseys, smocks, Ponchos, hats, pinafores, costumes, v-necks, windbreakers, greatcoats, jackets, frocks, coats, headdresses, wrappers, petticoats, t-shirts, vestments, fedoras, capes, jumpers, dinner jackets, sweat suits, parkas, corsets, tuxedoes, housecoats.
underwear (noun)
body suit, boxers, bustier, bloomers, body, bra, BVDS, undies.
women's underwear (noun)
undies, briefs.

Other synonyms:

underwear. Other relevant words:
underwear, bloomers, undies, briefs, boxers.