Frances Wood, left, and Sarah Hanks shop for free used clothing at a clothing swap sponsored by Brooklyn Clothing Exchange in New York in this Feb. 22 photo. With some help from the Internet, swaps among strangers are cropping up in bars, schools, garages and churches across the United States.

New York ? The turtleneck from designer Marc Jacobs costs hundreds of dollars at Neiman Marcus or Saks Fifth Avenue. But at one Brooklyn bar, the charcoal-gray sweater was free for the taking — along with jeans, belts and shoes.

The neighborhood watering hole called Sycamore will never be mistaken for a department store, but for some recession-battered consumers, it’s serving a similar purpose. It’s a chance to update their wardrobes and capture the adventure of shopping without having to open their wallets.

“It’s guilt-free shopping,” said Shannon McDowell, a bartender and swapper.

Friends have been trading among themselves as long as parents have been handing down outgrown baby clothes. Now, with some help from the Internet, swaps among strangers are cropping up in bars, schools, garages and churches across the United States.

The rules are simple: you bring something before you take something, and money never changes hands.

Some swaps are formal affairs, where items are passed along and tried on. If more than one participant is interested, the group votes on whom it looks best. Others, like the one at the Sycamore, are more casual: Everyone just digs through piles for what they want. Leftovers are generally donated to charity.

The popularity comes as Americans from every tax bracket are cutting back how much they spend at stores. Apparel sales declined 10.1 percent in the first three months of the year. Impulse buying, which represents more than a quarter of the fashion business, “is just not there at all,” said Marshal Cohen, chief industry analyst at market researcher NPD Group.

Swapping, it turns out, is one substitute for shopping. And it’s not just clothes. People are trading DVDs, books, toys and even house plants and garden seeds.

“People are naturally resourceful,” said Anneli Rufus, co-author of the book “The Scavengers’ Manifesto,” a guide to acquiring things for less. “At first, they are scared and shocked. But then, thank gosh, people are getting less ashamed in doing this.”

Put another way, the newly frugal are turning to a “basic, pre-money way of commerce,” she said.

Though the bartering has been around forever, many events are being organized with help from modern technology.

Meetup.com, a Web site that helps users organize local groups for people with common interests, has 42 clothing swap groups, up from 13 a year ago. The groups, which cost organizers $12 a month to maintain, have more than 4,500 members, up from 1,200 a year ago.

While many swaps are organized between friends and neighbors, Web sites like Swaptree.com and Paperbackswap.com help people trade old CDs, books and video games online. Totsswapshop.com, meanwhile, connects people who want to trade kids’ items from clothes to nursery furniture.