President TrumpDonald John TrumpDemocratic senator rips Trump's 'let them fight' remarks: 'Enough is enough' Warren warns Facebook may help reelect Trump 'and profit off of it' Trump touts Turkey cease-fire: 'Sometimes you have to let them fight' MORE was mocked on Twitter for his apparently ill-fitting formal wear during a state banquet hosted by Queen Elizabeth II at Buckingham Palace.

Trump attended the lavish feast with first lady Melania TrumpMelania TrumpMelania Trump breaks ground on new White House tennis pavilion Overnight Health Care — Presented by Coalition Against Surprise Medical Billing — Buttigieg unveils aggressive plan to lower drug prices | Supreme Court abortion case poses major test for Trump picks | Trump takes heat from right over vaping crackdown Kroger to stop sales of e-cigarettes at stores MORE, who was wearing a Dior Haute Couture gown, but Twitter users quickly jumped on the president over his tuxedo tails. 

Actress Bette Midler, a frequent Trump critic, detailed what she called a “proportion fail."

“His white waistcoat is at least two inches too long; tailcoat is supposed to be almost the same length as the waistcoat beneath, sleeves should be shorter and show a bit of the cuff below, waist itself is nipped in...what a figure he cuts! Fire the tailor!!” Midler wrote on Twitter.

MSNBC host Joy Reid asked royal experts on Twitter to weigh in on the length of Trump's vest tails.

Others compared Trump's attire to a similar outfit worn by former President Obama at a state banquet in May 2011, and joked about the fit of Trump's tails. 

Sen. Chris MurphyChristopher (Chris) Scott MurphyPelosi, Schumer hit 'flailing' Trump over 'sham ceasefire' deal Romney slams ceasefire deal, calls Trump's Syria move 'a bloodstain' in US history Backlash erupts at video depicting Trump killing media, critics MORE (D-Conn.) even weighed in, saying he was more concerned with Trump’s behavior during the three-day state visit.

“What I care about is how monumentally stupid it is for Trump to be cheerleading Brexit. There is no way to confront an expansionist Russia and a rising China without the United States and a strong, united Europe working together,” Murphy wrote on Twitter.

Trump on Sunday said that he would support the United Kingdom leaving the European Union without a Brexit deal if U.K. officials can't reach an agreement with EU leaders. 

"If they don’t get what they want, I would walk away,” Trump told Britain's Sunday Times just before the state banquet. “Yes, I would walk away. If you don’t get the deal you want, if you don’t get a fair deal, then you walk away.”