Here's the frugal version of Kate's outfit:
Blue and Green Striped Mini-Dress, $17.99 - BUY NOW
Brown Leather Belt, $19.95 - BUY NOW
Brown Flip-Flops, $3.50 - BUY NOW
Brown Messenger Bag, $44 - BUY NOW
Brown Aviator Sunglasses, $4.80 - BUY NOW
GRAND TOTAL $90.24
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