Catie (left) and Melissa Grimm at their boutique, Carrots. Photo courtesy of Jon Knox.

Figuring out how to dress for the fluctuating microclimates--and still look stylish--is an eternal challenge in this city.

Melissa and Catie Grimm, co-owners of Carrots, have a chic (and rather elementary) solution: Wear a jacket under another jacket. The impeccably dressed sisters offer some sartorial advice for pulling off the look:

Under: Fitted denim jacket Over: Oversize white blazer 

How to wear it: A slim-cut denim jacket, like this one from J Brand ($229), is a nice, light bottom layer that will fit well under a slightly oversize blazer. Melissa is wearing a double-breasted version from BLK DNM ($385) in white, which is always on trend--no need to wait for warmer weather.

Under: Hooded knit jacket Over: Trench coat 

How to wear it: On chillier days, layer a knit jacket like the one Catie is wearing from Lars Andersson (available at Carrots) or this striped bouclé one from Free People ($148) under a classic khaki or indigo trench. The Grimm gals teamed up with A'bout designer Dean Hutchinson to create the trench Catie has on.

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