Because the old ones weren't tight enough, perhaps. O the hours of fun they must have had cinching those up as snug as possible.

Lots of things going on here - the crooks, for example, are running out of the building with the standard tell-tale dollar-sign bags; that's normal. One of the crooks is wearing the loudest possible suit to assist with subsequent detection; that's fine. Batman and Robin obviously overshooting the scene: embarassing, but they can compensate if they stick the landing.

Professional photographer who happens to be walking by with her camera out as the thieves emerge from The First National Nondescript Purple Bank building - that strains credulity.