I took baba to the park today with my sister-in-law and niece. The weather report had promised a sunny day, but it was dull,dull,dull again with the sun making just a fleeting appearance. As much as I love spending time with baba, I find days at the park quite difficult from a dressing point of view. The reason for this is I just can’t do casual.  Don’t get me wrong, I like jeans as much as the next woman, but I just can’t live in them.  My sister-in-law is style supreme in casual dress, avoiding excessive black for softer charcoals, with fab La redoute silver leather sandals and just a…