Kaia Gerber color coordinated for a party at a friend's house in Los Angeles. Naturally, the 23-year-old had to wear her favorite $80 J.Crew cashmere sweater for the occasion. The cropped navy knit had been spotted at least twice before in New York, styled with black leggings at the gym and low-rise jeans and sneakers when running errands.

On December 15, she paired this very affordable, not to mention comfortable, item with blue cotton drawstring pants from Leset. The shade matched almost perfectly with Charli XCX's “Sweat Tour” blue baseball cap from her concert series with Troye Sivan.

Gerber accessorized her casual daytime ensemble with black leather ballet flats by Repetto, the only shoes she wears regularly besides Onitsuka Tiger sneakers. Jennifer Lopez also loves her Repetto ballet flats, which she likes to match with her Birkin bag for the day.

Here Gerber took a similar approach with her trusty black Balenciaga City bag. The nostalgic 2010s tote bag has also been spotted on the arm of fellow model Kate Moss this year amidst Balenciaga's ongoing comeback.

Gerber was last seen carrying hers in November. At that time, she wore this investment item with very similar styling: black ballet flats, a cherry red cardigan, and matching red pull-on pants.

Clearly, Gerber has found a distinctive clothing equation. She even put it down to library science.