Fall Work Outfits for Women: Business Casual Ideas for Cooler Days

Two women in an office lobby wearing a black trouser suit and a taupe button-front cardigan with black wide-leg trousers.

A trouser suit and a cardigan give you more than one way to get dressed for the office.

The trousers from Monday’s suit can be Wednesday’s cardigan outfit. That’s a useful way to shop for fall: buy the combination, then make sure the pieces work apart.

These fall work outfits for women start with a black trouser suit and a removable knit. Add the plain tops and closed-toe shoes you already wear, and you have options for a meeting-heavy day or a quieter one at your desk.

Keep the base simple on meeting days

Wear the Black single-button blazer and trouser set over an ivory crew-neck fine knit. The fitted jacket defines the waist, while the wide trouser legs give the outfit a looser line below. Black loafers keep the shoe choice straightforward.

The catalog photo shows the suit without a top underneath. For work, add an opaque base that covers your chest and midriff when the jacket opens. A collared blouse makes this combination a little more formal; a plain knit works when your office allows a more relaxed top.

A fine layer is easier to accommodate inside this fitted blazer than a bulky sweater. Keep the cardigan for the second outfit, and wear the suit together when you want the more tailored option.

Black single-button blazer with notched lapels and flap pockets, paired with matching wide-leg trousers.
Single-button blazer & trouser set · Black · Add a blouse or fine knit for the office.

Keep the cardigan within reach

On a desk day, pair the same black trousers with the marled cardigan in Camel, the muted taupe shade pictured, and a white crew-neck tee. The knit’s texture changes the outfit even though the trousers and shoes stay the same.

Wear it buttoned as shown, with the tee’s neckline visible. For longer keyboard sessions, turn the broad cuffs back enough to clear your hands. If the office is particularly cold, use a thin long-sleeve tee underneath.

This is a relaxed business casual option. Your employer’s dress code takes priority; if a jacket is expected for a presentation or client visit, use the blazer combination that day.

Oversized taupe marled cardigan with a ribbed V-neck band, four brown buttons and wide ribbed cuffs, over a white tee.
Marled cardigan · Camel

Give the commute its own layer

For a colder journey, the short wool coat in Camel is another option over the plain top and black trousers. Its listed fabric is 100% wool. Carry the blazer separately, or keep the cardigan at the office if you have somewhere to store it, so you can change layers when you arrive.

If you already own a coat that works with these clothes, use it. The useful purchase is the piece that fills a gap: tailoring for meeting days, or a knit you can wear with several pairs of trousers.

Before you add anything else, name two workdays you’d wear it. That’s your reason to buy.

Product photos: Luxxella. The suit includes the blazer and trousers; the cardigan, base layers, coat, shoes and bag are separate.