Each year, hundreds of people don their finest hats — some silly, some serious — to march in style up Fifth Avenue during the annual Easter Parade and Bonnet Festival. And that’s keeping some of the city’s hat makers busy. Evetta Petty, owner and milliner at Harlem’s Heaven hat shop on Adam Clayton Powell Boulevard, said Easter marks the start of her busy season, which continues through Mother’s Day — and includes big horse races like the Belmont Stakes, where flamboyant hats are always a big fashion statement. She said she's often inspired by the local fashionistas in Harlem, especially the church-going crowd. But his week, she was hard at work on floral designs to herald spring. “I’m doing little fascinators, little mini-hats, what we used to call cocktail hats years ago, and I’m covering them in bright, silk flowers, she said. Petty's often marched in the parade herself. “We wear serious, fabulous millinery, she said. “We’re all about a real hat. It’s not a hat with a bunny rabbit or plastic Easter eggs on it. Petty’s hats aren’t meant for a single occasion, but as essential accessories to wear more than once. Another hat-maker, who goes by just one name, Bunn, said it was his philosophy as well. “I believe that the same hat you wear on a Sunday, you should be able to wear on a Wednesday, he said. His shop, Hats by Bunn, is about 10 minutes south of Petty’s. Bunn has been making hats for about 35 years. The designs don’t follow any particular rules, he said. They’re as unique and individual as his customers. “The hat is the exclamation point to any outfit, he said.