Buying a knockoff used to be a consumer's dirty little secret, largely because a "fake" was considered inferior to the real thing. These days, brand imitators, also known as dupes, have elbowed their way into the mainstream. In many cases, buying a dupe is just more "financially responsible" at a time when many consumers feel cash-strapped, one expert said.

From leggings to lip gloss, there's a dupe for almost any brand-name product. Buying a knockoff used to be a consumer's dirty little secret, largely because a "fake" was considered inferior to the real thing, not to mention the economic cost and intellectual property rights infringement . But brand imitators, also known as dupes — short for duplicates — have elbowed their way into the mainstream and are now even cool .

More from Personal Finance: 'Recession pop' is in: How music hits on economic trends 'I'm looking for a man in finance' 'I cry a lot but I am so productive, it's an art' "It's not necessarily because the consumer doesn't love the brand, sometimes it just makes more financial sense to buy the dupes," said Sara Walker, a Los Angeles-based influencer and fashion industry expert. Unlike illegal counterfeit goods, which tend to carry an unauthorized trademark or logo of a patented brand, these dupes are cheaper, typically legal alternatives to premium or luxury consumer products, and in some cases preferred to their pricier counterpart. "It's not a direct knockoff, it's kind of revising something that's very .