Side snapping nappies are great for the thunder thighed bub My fella had saddle bags pmsl!

To add onto the couple that Mel suggested you could try berry plush, starbunz, bubble bubs (yes they make a side snap that is awesome but they are a bit rare ATM but they do pop up on B4B - perhaps you could email the store cos they are worth it), beetlebums, and for fitteds Very Baby.

HTH