Kate Middleton's fashion hack for a seamless silhouette revealed during Windsor Castle royal engagement

Kate Middleton recently wore an elegant trouser suit as she met with crew members from HMS Glasgow - but you may have missed the subtle fashion hack that helped create a streamlined silhouette on the day.

• The Princess of Wales looked chic in her Alexander McQueen Crepe Blazer with coordinating trousers and a simple cream blouse underneath.
• Her stylish blouse is actually a bodysuit from Holland Cooper, creating the illusion of a tucked-in blouse flawlessly. 
• In other royal news, Buckingham Palace releases a touching new photograph to honor the late Queen's bond with one of her favorite ponies.

The Princess of Wales always looks stunning in photographs, so it's no wonder she's picked up a few fashion and beauty hacks along the way.

Recently, we discovered Kate Middleton's trick for always looking flawless in paparazzi photos (keeping her chin parallel to the ground) and Catherine's travel hack for always looking pristine (her dresses have their own seat!) Plus, we're well versed in the Princess of Wales' trusty trick for staying secure in heels (ladder-resistant tights). 

But during a recent royal engagement at Windsor Castle, Catherine's sleek trouser suit inspired by the navy outfit gave us some insight into another fashion hack for sleek and stylish dressing. 

Earlier this month, when Princess Catherine made an appearance for a surprise engagement to meet the Royal Navy Ship's Company of HMS Glasgow, she wowed in an elegant trouser suit with - what looked like - a simple white shirt underneath, tucked into her fitted trousers perfectly.

However, her elegant white shirt wasn't actually a shirt at all - but the 'Cupro Shirt' bodysuit from British brand Holland Cooper, as reported by HELLO! The bodysuit retails at $164/£149 and is still in stock on the brand's website in small, medium, and large sizes.

The Holland Cooper website explains, "Thanks to our nylon elastane thong base, made with our superior knitting technique this ensures our bodies have a flawlessly smooth fit every time."

Holland Cooper Cupro Shirt Bodysuit: $165/£149 | Holland Cooper
This elegant bodysuit offers a streamlined look, whether worn with trousers, jeans, or a skirt.

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As well as offering a seamless silhouette, the Curpo Shirt bodysuit also has elegant details on the collar and sleeves, making it a special investment piece that can be worn alone for a striking look, or under a blazer as Catherine has worn it.