I used to more or less observe the "no white before Labor Day" rule, until one of my friends pointed out that it gets too hot around NYC to wear white jeans in the summer. If you follow the rule, you could miss the window for white denim entirely. I've changed my approach over time, and now confidently mix white into my spring wardrobe.
I like to balance bright white with deep, vibrant tones that keep the outfit from becoming too summery. I love the rich blue background of this Joie blouse, which still hints at spring with its delicate blossom print. Joie makes beautifully feminine blouses that drape perfectly.