DRESS - PRIMARK | TOP - TOPSHOP | SHOES - TOPSHOP | BAG - PRIMARK 
You really can't go wrong with a little black dress. Or even a little black pinafore dress. The pinafore/dungaree style is a favourite of mine at the moment. It's super casual but also brings back memories of my aqua blue little mermaid dungaree dress I had as a child. I actually brought the red version of this dress. However a day at work and a rip appeared. I returned it though then found the black version! While in all honesty I'll probably get more wear out of, because well it's black.