I don't usually have a 'does my arse look big' fixation - I'm pretty much happy with my body shape - 5'10 and a size 12. And I can usually carry off most styles and clothes.
But I've been trying to find some shorts to wear 'in public' and they all look horrible. I have a couple of pairs of very short-shorts which only just cover my bum and they actually seem the most flattering style - I wear them in the garden when I'm sunbathing, but wouldn't dare wear them out 
But when I try any longer ones, be them tight or loose, just above the knee or a bit shorter, I just look like I have a big fat bum and silly little legs like sticks below the knee.
Can any style gurus help me? I seem to remember Trinny & Suzannah once saying that shorts suit no-one, but I try not to listen to them 