The lawsuit, that was filed in Chicago, claims customers bought items because of LL Bean's unlimited satisfaction guarantee and accuses LL Bean of breach of warranty.
The retailer announced last week that it's imposing a one-year limit for most returns, because it says too many people are abusing the system.
A company spokeswoman said the lawsuit misrepresents the return policy. And that purchases made before February 9th of this year are not subject to the new policy as long as there's proof of purchase.
The plaintiff is seeking class-action status for the lawsuit filed on Monday.
The lawsuit seeks unspecified damages or an order that LL Bean honor the old warranty.