1.  overcoat(n = noun.artifact) greatcoat, topcoat - a heavy coat worn over clothes in winter;
is a kind of coat
has particulars: capote, hooded coat, chesterfield, surtout, ulster

2.  overcoat(n = noun.artifact) overcoating - an additional protective coating (as of paint or varnish);
is a kind of coat, coating

   A coat worn over the other clothing; a greatcoat; a topcoat. [1913 Webster]

overcoat, n.
1 a heavy coat, esp. one worn over indoor clothes for warmth outdoors in cold weather.
2 a protective coat of paint etc.

N  clothing, investment, covering, dress, raiment, drapery, costume, attire, guise, toilet, toilette, trim, habiliment, vesture, vestment, garment, garb, palliament, apparel, wardrobe, wearing apparel, clothes, things, underclothes, array, tailoring, millinery, finery, full dress, garniture, theatrical properties, outfit, equipment, trousseau, uniform, regimentals, continentals, canonicals, livery, gear, harness, turn-out, accouterment, caparison, suit, rigging, trappings, traps, slops, togs, toggery, day wear, night wear, zoot suit, designer clothes, masquerade, dishabille, morning dress, undress, kimono, lungi, shooting-coat, mufti, rags, tatters, old clothes, mourning, weeds, duds, slippers, robe, tunic, paletot, habit, gown, coat, frock, blouse, toga, smock frock, claw coat, hammer coat, Prince Albert coat, sack coat, tuxedo coat, frock coat, dress coat, tail coat, cloak, pall, mantle, mantlet mantua, shawl, pelisse, wrapper, veil, cape, tippet, kirtle, plaid, muffler, comforter, haik, huke, chlamys, mantilla, tabard, housing, horse cloth, burnoose, burnous, roquelaure, houppelande, surcoat, overcoat, great coat, surtout, spencer, mackintosh, waterproof, raincoat, ulster, P-coat, dreadnought, wraprascal, poncho, cardinal, pelerine, barbe, chudder, jubbah, oilskins, pajamas, pilot jacket, talma jacket, vest, jerkin, waistcoat, doublet, camisole, gabardine, farthingale, kilt, jupe, crinoline, bustle, panier, skirt, apron, pinafore, bloomer, bloomers, chaqueta, songtag, tablier, pants, trousers, trowsers, breeches, pantaloons, inexpressibles, overalls, smalls, small clothes, shintiyan, shorts, jockey shorts, boxer shorts, tights, drawers, panties, unmentionables, knickers, knickerbockers, philibeg, fillibeg, pants suit, culottes, jeans, blue jeans, dungarees, denims, Levis, Calvin Klein, Calvins, Bonjour, Gloria Vanderbilt, headdress, headgear, chapeau, crush hat, opera hat, kaffiyeh, sombrero, jam, tam-o-shanter, tarboosh, topi, sola topi, pagri, puggaree, cap, hat, beaver hat, coonskin cap, castor, bonnet, tile, wideawake, billycock, wimple, nightcap, mobcap, skullcap, hood, coif, capote, calash, kerchief, snood, babushka, head, coiffure, crown, chignon, pelt, wig, front, peruke, periwig, caftan, turban, fez, shako, csako, busby, kepi, forage cap, bearskin, baseball cap, fishing hat, helmet, mask, domino, body clothes, linen, hickory shirt, shirt, sark, smock, shift, chemise, night gown, negligee, dressing gown, night shirt, bedgown, sac de nuit, underclothes, underpants, undershirt, slip, brassiere, corset, stays, corsage, corset, corselet, bodice, girdle, stomacher, petticoat, panties, under waistcoat, jock, athletic supporter, jockstrap, sweater, jersey, cardigan, turtleneck, pullover, sweater vest, neckerchief, neckcloth, tie, ruff, collar, cravat, stock, handkerchief, scarf, bib, tucker, boa, cummerbund, rumal, rabat, shoe, pump, boot, slipper, sandal, galoche, galoshes, patten, clog, sneakers, running shoes, hiking boots, high-low, Blucher boot, wellington boot, Hessian boot, jack boot, top boot, Balmoral, arctics, bootee, bootikin, brogan, chaparajos, chavar, chivarras, chivarros, gums, larrigan, rubbers, showshoe, stogy, veldtschoen, legging, buskin, greave, galligaskin, gamache, gamashes, moccasin, gambado, gaiter, spatterdash, brogue, antigropelos, stocking, hose, gaskins, trunk hose, sock, hosiery, glove, gauntlet, mitten, cuff, wristband, sleeve, swaddling cloth, baby linen, layette, ice wool, taffeta, pocket handkerchief, hanky, hankie, clothier, tailor, milliner, costumier, sempstress, snip, dressmaker, habitmaker, breechesmaker, shoemaker, Crispin, friseur, cordwainer, cobbler, hosier, hatter, draper, linen draper, haberdasher, mercer, diaper, nappy, disposable diaper, cloth diaper, Luvs Huggies, invested, habited, dighted, barbed, barded, clad, costume, shod, chausse, en grande tenue, sartorial, the soul of this man is his clothes.