It strikes me that the BMI Baby crew can look as professional in their attire as they like. I've seen some look like they came out of a J class cabin and others that look like they are off to do some gardening!
As for the cabins - the older fabric seats (which seem to be in the majority) are life expired and are really quite uncomfortable for anything more than a short domestic flight.
What about the names the aircraft have - bit of a difference between the Qantus's majestic 'Spirit of Australia' and Baby's 'Ice Ice Baby' or 'Foxy Baby'.