Kate Middleton's wedding dressmaker said she would have made one big change to Pippa Middleton's bridesmaid gown

• Chloe Savage did the embroidery on Kate Middleton's iconic wedding gown.
• Savage told Insider she would've made one big change if she'd done Pippa's bridesmaid dress.
• She said that Pippa's dress "needed a little more room on the butt."

As Kate Middleton and Prince William celebrate their 10th wedding anniversary this week, it's the perfect time to look back on royal wedding fashion.

And Chloe Savage, who helped make Kate Middleton's iconic wedding gown, has some strong thoughts on one particular dress that made headlines that day - and it wasn't Kate's.

Savage told Insider that if she had made Pippa Middleton's bridesmaid dress, she would've "given it a little more room on the butt."

"It's not her fault, nobody's mistake," she added. "I would have just given it a bit more room so it wasn't so clingy."

Pippa's bridesmaid dress, like Kate's gown, was designed by Sarah Burton, the creative director of Alexander McQueen. The figure-hugging dress featured a cinched waist, capped sleeves, and 58 buttons that ran all the way down the back.

The gown immediately caught the world's attention, making headlines before the ceremony was even over. Pippa's ensemble was hailed as the most iconic bridesmaid dress of all time as some media outlets pondered whether she had outshone her sister.

"The bridesmaid should really not be stealing the show," Savage said. "It was a beautiful dress, absolutely stunning. But as a dress designer, the aim is to make the bride the star of the show."

It would be three years before Pippa addressed her famous frock, joking at a dinner event in London that "recognition has its upside, its downside, and - you may say - its backside."

"In retrospect, it fitted a little too well," she then said of her iconic bridesmaid dress.

Savage said she believes the sisters "probably would have seen the funny side" of the media circus around the gown.

As with Pippa's bridesmaid dress, Savage told Insider that she thought there was one major issue with Princess Diana's iconic wedding gown.

"It was a beautiful dress, but someone should have warned them that it was going to be stuffed in the carriage!" Savage said. "It looked like it needed to be pressed."

Princess Diana's wedding gown was designed by the husband and wife duo Elizabeth and David Emanuel. It featured a 25-foot-long train, which rode with Diana as she made her way to St. Paul's Cathedral in London.

Savage, who now runs Chloe Savage Embroidery, said she was shocked that they didn't have a steamer on hand.

"You could have brushed it over before she walked down the aisle. It would have taken 10 minutes and all those creases would have dropped," Savage said.

"It was a beautiful dress, very '80s, very her," she added. "But if you look at it you go, 'Oh my God, is it that creased?' It would have never occurred to anyone that it would have screwed up that badly."

Even Elizabeth Emanuel admitted that she was "horrified" when she saw Diana step out of the wedding carriage.

"We did know it would crease a bit, but when I saw her arrive at St. Paul's and we saw the creasing I actually felt faint," she said during an appearance on ITV's "Invitation to a Royal Wedding" in 2018.

"I was horrified, really, because it was quite a lot of creasing," she added. "It was a lot more than we thought."