When a new season arrives, we fashion girls can't help but feel the urge to revamp our entire wardrobe. Luckily, this season, just a few staple pieces are all it takes to completely modernize your closet.

Haley Bieber's October lineup is a great example of these staples. On a recent outing after giving birth, this model looked like a walking mood board for fall fashion trends. Wide pants, loafers (usually in classic black or burgundy), leather bomber jackets, and big bags.

On October 29, she was photographed enjoying a romantic spa night at the Pereker Luxury Spa in Beverly Hills with husband Justin Bieber; the two were dressed casually, Justin in sweats and fur slippers (his signature look ), while Haley wore the aforementioned outfit equation. [taupe pants, maroon loafers, and a chocolate leather bomber jacket, finished off with a $20 Carhartt hat and a $3,250 Loewe flamenco bag. (Editor's note: It was this very brand's “padded bomber jacket” that sparked Bieber's obsession with bomber jackets.)

Bieber's oversized Loewe flamenco bag, a slouchy style with a curved opening and elongated strap, first appeared in the late 20th century. and first appeared in the late 20th century. (Some sources say it was born in the 1970s, others in the 1980s.) Flamenco was then retired until Coach's current creative director, Stuart Vivace, revived the style during his tenure. Since then, Flamenco's soft leathers and spacious interiors have attracted the likes of Taylor Russell and Jennifer Lawrence, and even inspired Hailey Bieber, aka the Saint Laurent Girl, to take down her leopard-print YSL tote this fall.

Bottom line: Haley Bieber is the blueprint for fall fashion and investment bags.