When San Fran-based Wells Fargo merged with Wachovia last year, there was a culture clash. Sources say that in recent months Wells workers have flown in to meet their Charlotte counterparts wearing short-sleeve polos and khakis. Only problem? It's too casual, and Wachovia execs asked them to change, prompting a run on dress shirts at uptown's Jos. A. Banks. "It's a huge culture difference. We dress more Wall Street," says one Wachovia source. Adds Alexandra Ball of Wells Fargo/Wachovia's corporate communications: "As with any merger, there are some similarities and differences between the two companies. … We are not focused on what people are wearing." Still, it's nice to think that Wachovia is getting the upper hand in at least one part of the merger.