You may not be able to buy the Sport paired with a non-Sport band, but it still looks great as an accessory.
After a weekend of travel, I finally got a chance to visit the Apple Store to "officially" try on the Apple Watch. Despite having already placed my preorder — a 38mm Sport with White Sport Band, along with a separate Milanese Loop — I came prepared with a list of watches I wanted to try, just to try them.
In addition to trying on a variety of preset Watch/band combos, the in-store specialists let me actually swap out a few 38mm Watch bands on the 38mm Sport body. Here's how the Milanese looks on the Sport, along with a few other in-store comparisons (and a quick Siri test).