Aside from the dramatic slide in quality over the past few years, there's another reason to stop being a Lands' End customer. Dustin Siggins writes: At issue is the cover of the spring issue of Lands’ End, a leading clothing retailer that was purchased by Sears for $1.9 billion in 2002, but valued last summer at $779 million, according to a Fortune profile of the newly-independent company. It is