Kate Middleton wears ‘The Boyfriend’ shirt by With Nothing Underneath in ‘Off White’.
The Princess debuted the shirt during a visit to the Natural History Museum on September 4, 2025.
She made a quietly stylish return to work following the summer break, wearing earthy green and brown tones—a nod to the nature-themed engagement, which took place in the museum’s newly transformed gardens.
Kate styled the shirt with the white cuffs poking out from under her blazer’s sleeves, elevating the look with polish.
Let’s look at the shirt in detail now.
Sustainable, practical AND stylish:
Designed in London and crafted in Portugal, the shirt is a beautifully pared‑back piece crafted from 100 % TENCEL™ Lyocell.
Tencel Lyocell is a sustainable and biodegradable fabric derived from responsibly sourced wood pulp. It’s this silky-soft fabric that gives the shirt its luxuriously fluid drape.
Tencel is an airy, crease-resistant fabric that resists wrinkles and maintains structure throughout the day.
Find it at With Nothing Underneath for £120 GBP / $190 USD (worldwide delivery and other currency options are available).
Design Details:
The white shirt embraces a “boyfriend” silhouette—relaxed yet tailored—with slightly dropped shoulders for effortless elegance.
The piece features a collared neckline, single-button cuffs, and two pleats across the yoke for subtle structure.
Fit & Sizing:
The fit is intended to be slightly oversized—“borrowed from the boys,” yet perfectly adapted for women.
It’s true to size for those seeking that easy, nonchalant drape; for a more tailored fit, sizing down is an option.
About WNU:
With Nothing Underneath (WNU), founded in 2017 by former Vogue and Tatler editor Pip Durell, has become beloved for its expertly cut, everyday button‑downs priced accessibly (starting from around £95 to £120)
The brand’s shirts have achieved cult status in London and become a go-to for those chasing minimal yet impeccably considered shirting.
The brand is known for its precision, simplicity, and longevity.
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