ex-crew, no worries you'll be just fine....BA (as I'm sure most other BA crew & pax will confirm) are not known for recruiting people SOLELY on how they look....there ain't a 'BA look' and there are many that don't have Victoria Beckham waistlines...(that would be worrying!)
As you know, as long as you can strap in comfortably and walk the aisles...then all you need do is concentrate on meeting the other requirements.
Good luck!