Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Abercrombie & Fitch (NYSE: ANF) jumped 10% in intraday trading today, after the company announced that same-store sales rose 13% in September.

So What: After its sales struggled through the recession, shoppers have returned to Abercrombie & Fitch stores, blowing out analysts' expectation of a 3.6% rise in same-store sales. This is a big win during the crucial back-to-school season, and it outpaced the overall industry's 2.8% rise in same-store sales.

Now What: Investors have seen Abercrombie & Fitch's fortunes go south since 2008, when the company booked $475.7 million in net income. A huge jump in sales like this shows that performance is really turning around; we should see big improvements when results are announced next month. I'm buying a big turnaround for Abercrombie & Fitch, and I think there's plenty of upside to come for this retailer.

Fool contributor Travis Hoium holds no position in any company mentioned. Try any of our Foolish newsletter services free for 30 days. True to its name, The Motley Fool is made up of a motley assortment of writers and analysts, each with a unique perspective; sometimes we agree, sometimes we disagree, but we all believe in the power of learning from each other through our Foolish community. The Motley Fool has a disclosure policy.