Here's a similar look:
blazer (86.99 orig 150) shorts (17.80) tee (21.00) bib necklace (16.99) ball necklace (26.90) sandals (49.00)
If you have an old blazer, you could crop the sleeves to give it a more casual and modern feel like the one above. Denim shorts are best when worn a little baggy and not too short or tight. Even though the 70's style is back, trashy is not. Shorts not your thing? Try boyfriend jeans for a similar, easy look.