A Sears spokeswoman declined to disclose the extent of the test program, which started a month ago.
"No one knew where they were going to land at the time she left," said Janice R. Drummond, a Sears spokeswoman.
As a result, apparel sales have increased by 50 percent since 1996, said Linda Blakely, a Sears spokeswoman.
A Sears spokeswoman said she did not know why Ms. Kelly was leaving or what her plans were.
A Sears spokeswoman said the lines would be "more fashion-oriented" than most Sears women's apparel.
A Sears spokeswoman said the Chicago-based retailer planned to continue the pilot program at least through October.
A Sears spokeswoman said it would be "inappropriate to speculate" about a possible move by Martha Stewart.
Jan Drummond, a Sears spokeswoman, said there were a "litany of things" that could have affected sales, including ice storms and high home heating prices.
Jackie Bitowt, a Sears spokeswoman, said the company provided such lists but its outlets had to order them.
A Sears spokeswoman, Jan Drummond, said, "This has been the outstanding item and it is a relief to finally have a resolution."