A grandma? No way. I wish my grandma had been as glamourous, I would have been in her wardrobe in a nanosecond! I love, love, love number one. I think you made the right call without the jacket (temperature aside) there is no need for one with this outfit, it speaks volumes as it is. If you were needing to wear one of the jackets, I like the white one the best
Loving the white jeans outfit too, I tried an outfit very similar last week, with navy on top. I decided since I paid so much for my great fitting white jeans no way was I going to only wear them during the 8 week British summer!