We believe Kate Middleton wears a black cashmere crewneck jumper by the British brand Boden.
Due to the nature of the garment, it’s difficult to say for certain—but plenty of elements match up, so I suspect the ID is correct. Many in the Kate fashion community believe the Princess wears this sweater.
Here’s a closer look at the ribbing detail around the neckline:


The sweater retailed for $170 at bodenusa.com and £115 boden.co.uk. It’s no longer available. Boden does stock another cashmere sweater, the ‘Eva’, with similar detailing. See it here.
The Princess debuted the sweater in 2022. We’ve seen her wear it five times in public, to date.