Going back to school next month will be no sweat for some kids, a lot of sweat for others.

Sweat clothes are hardly new to kids who have long found comfort in sweat shirts and pants, sometimes in

basic gray, sometimes in bright colors. Now, taking a cue from designer Norma Kamali, sweat clothes have come out of the locker room. They've been tucked and tiered, shaped, padded and printed, painted and appliqu,ed. Whatever, they still remain the easiest way to dress and the easiest clothes to take care of. CAPTION: Picture, The standby, classic, red zip-front jacket and sweat pants ($17.99) with hidden tank top underneath ($2.49) at Sear's.

For the older boy, layers of red and gray beginning with a gray padded vest ($30) over red and gray cotton knit sweater ($18.50) and red plaid shirt ($9.90) at Bloomingdale's Boys Shop.

More bright red, even for the tiniest student, in a hooded, zip-front sweat jacket and pants ($26) at the Young People's Shop at Lord & Taylor.

The rah-rah skirt goes kids' size with this royal and red stripe dolman-sleeve top ($36) and cheerleader skirt ($28) by Norma Kamali's Kids at Lord & Taylor.

Classic gray sweats get a lift from ruffled shoulders, multicolor heart appliqu,es and jodhpur pants ($48) by Saprrow at Saks Fifth Avenue.

Borrowed from the ballerina, brightly striped leg warmers and bateau-neck top in acrylic knit by Jet Set ($21.50) worn with Izod for Girls mint green cords ($28) at Woodward & Lothrop. PHOTOGRAPHS BY BILL SNEAD