This is proper dress in a Qantas lounge. (Photo: Qantas)

Apparently, clothes do make the man — and the woman.

Qantas Airways is cracking down on its dress code in its Business Class lounges. Starting on April 1, travelers flying through Sydney, Melbourne, Brisbane, Canberra, Perth, and Adelaide airports will be expected to wear “smart casual dress” in order to gain entrance to the lounge. In other words, if you look like a bum, you can’t go in.

The new guidelines actually aren’t new at all. Qantas has always had a dress code that prohibits bare feet, rubber flip-flops, and “clothing with offensive images or slogans.” And in case you’re coming from a wrestling match, singlets are against the rules, too.

Qantas made the decision to enforce its own rules after fielding complaints from passengers appalled at how other people were dressing in the lounge.

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"Lounge staff will use their discretion to determine if a visitor to the lounge meets our smart casual dress guidelines,” Qantas said in a statement.

Until April 1, signage will also be displayed at the entry of each lounge, reminding travelers of the guidelines.

One group that gets a wardrobe pass are airport workers. They will be permitted to wear their bright neon vests inside the lounge. But for the rest of you, leave those Juicy tracksuits at home.

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