Agree that the colour scheme's very naff, plus horrible shoes and gross ribbing on skirt and disgustingly twee, otherwise really not bothered.
I think it's meant to be 'comedic' or the like.
My understanding is that people (usually women) wear high heels in part to make their arses look cute (well, I do, occasionally, anyway). I guess that's part of the reason for focussing on an arse in the ad. Or maybe it's a joke about wearing high heels and falling over.
Gosh, that's a lot to say about something I really don't care about.