I agree with the PP.

With A we just had soft soled shoes but she would walk outside in nice weather bare foot, most places like target etc have the 'pre-walkers' which are quite soft and although they do wear out on concrete a bit they are probably the softest you will get before going to soft rubber soles.

A had the cutest pair of converse runners DP's cousin bought, very soft soles and ohhh so cute.. she loved them BRIGHT PINK.. i still have them for Z, might put them on her today if they fit