I would get a nice summery dress, I got a lovely one that you can dress up with heels and jewellery or dress down with flat shoes for daytime occasions like christenings, BBQs or even just lunch with dh, one of them ones you wear time and time again, always comes in handy and simple crossover style that never goes out of fashion and it covers my awful knees!
I would also get a long sleeved shrug - ideal if its a bit chilly and you want to wear a pretty strappy top but need the warmth of sleeves without covering the entire top, it also means you can wear your vest tops all year round!
Im a fan of those linen trousers that roll up to make cropped trousers - also ideal to wear all year round!
I would also get some flat or wedge shoes - ideal for walking about in the sunshine and handy to keep at the back door to slip on when pegging the washing out - some that are smart casual, ideal with jeans to go to supermarket or with a dress when going out somewhere nice!
A medium sized bag, to fit in a bottle of water, sun cream, purse, keys, phone and baby wipes!
A couple of tops smart/casual even just a cheap vest with a few sequins on.
Then just the usual vest tops and t-shirts!