• Three Manhattan milliners Patricia Underwood, Anne Moore and Eric Javits — are leading the revival in hats. BY RHONDA COHEN n the 1930s and '40s, women donned hats with pride as they paraded down the street. Now, in the spring of '89, hats are popular again, from the fancifully trimmed to the broad-brimmed, and three New York City milliners are heading the renaissance. London-born Patricia Underwood, who has been designing hats for 15 years, originally became involved in hatmaking through her strong interest in fashion. "I took a class at F.I.T. (Manhattan's Fashion Institute of Technology) but had no set hat or fashion design experience," recalls Underwood from her West 40th Street studio. "I learned a lot from the people I worked with in the industry and eventually hooked up with a schoolmate to start a hat business. Then, in 1976, I branched off into my own business." Underwood's broad-brimmed straw hats appearing in fashion layouts in publications like the may now be synonomous with New York Times elegance but it wasn't easy to make her name known. "At that time, there was no competition (in the hat business) and I had to really rely on my wits and persistence to keep me going," she says, recalling the first hat she ever made, a green velour with a red ribbon inside. "I had to bring my stuff to the stores myself because my main goal was to keep going, get — 44 IN STYLE