Comic book companies often look at costume design as "the more changes, the better." Batman is a character who had one of the most famous costume changes in comic book history (albeit just by adding a simply yellow oval), but otherwise managed to only go through a handful of looks in the 20th Century. In the 21st Century, though, Batman has gone through as many costumes as he had in the first 50 years of his existence, and more new looks are undoubtedly coming in the future!
When Greg Capullo drew the armor in "Batman," however, he made it look a lot more relaxed and natural-seeming. It worked a lot better in that context, especially as Capullo's "Batman" was constantly in motion, which didn't really fit with the stiff design of the armor. Capullo kept that in mind when he got the chance to re-design the costume at the end of his run on the book.
Harley Quinn: Best known as "The Joker's Girlfriend", Harley has had occasional romantic encounters with Batman, most notably her kiss with him in the episode Harley's Holiday from Batman: The Animated Series. Recently, in the The New 52, there have been a couple of stories in which Harley became infatuated either with Bruce Wayne or Batman. These attractions appear to be entirely one-sided and Batman has shown no signs of attraction towards Harley.
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