While it was hard to find a sweater quite like hers—with its neon tie-dye stripe effect on a neutral beige cashmere background—I think an oversized tie-dye sweatshirt achieves a similar upbeat look.

And Old Navy has all the latest styles of denim you're looking for right now, including this straight leg pair with a distressed hem, similar to Alessandra's.

Finish the casual California look with some white lace-up sneakers; if you want Golden Goose vibes, this star sneaker is a great option that won't break the bank!