He may be allowed to dress like an oaf in the United States Congress — but Sen. John Fetterman would be shown the door at the Big Apple’s finest restaurants.

Sen. John Fetterman may be allowed to dress like a slob in the halls of power — but it’s still a capital offense in New York City’s finest restaurants.

Intrepid Post reporter Jon Levine learned that hard truth this week when he crisscrossed the Big Apple’s culinary landmarks wearing Fetterman’s trademark hoodie, gym shorts and sneakers and tried to gain entry — only to face scorn and mockery from maître d’s with more common sense than Congress.

“He would not be permitted here,” sniffed a maître d at Daniel on the Upper East Side, where a seven-course tasting menu runs $275.

At famed Le Bernardin, a suited maître d named Julien served up an amuse bouche of stink-eye when The Post arrived.

“No athletic wear,” he said flatly, staring The Post down and denying even a nibble of chef Eric Ripert’s $480 dinner and wine pre-fixe menu.

At the double-Michelin star Jean-Georges near Columbus Circle, no less than four sentinels outside its dining room vetoed The Post’s entry, ending the dream of feasting on the famed $368, 10-course tasting menu that includes caviar salad, king crab and smoked squab.

“Inside we don’t allow shorts,” said one, repeatedly insisting it would be “impossible” to get around the dress code, which also forbids jeans, sneakers and sweatshirts.

Workers at The Grill — an ultra-lux chophouse occupying the legendary Four Seasons Restaurant space in midtown — wasted no time rejecting the faux Fetterman, holding the door tightly shut after they caught one glimpse.

“If you went and got a pair of jeans it would work,” offered a doorman named Don who boasted, “We treat the billionaires just like millionaires.”

Rep. Marjorie Taylor Greene (R-Ga.) ripped the Senate for recently relaxing rules to allow Fetterman’s wardrobe, which he insists he needs for his mental health after his stroke, say Senate Democratic insiders.

“The Senate no longer enforcing a dress code for senators to appease Fetterman is disgraceful,” Greene posted on X, formerly Twitter.

“Dress code is one of society’s standards that set etiquette and respect for our institutions. Stop lowering the bar!”