where the only acceptable style is jacket with pants?
Well, there’s the Scottish, who can do a gussied-up kilt.
https://en.wikipedia.org/wiki/Highland_dress
Formal evening wear (white tie)
The traditional white-tie version of Highland dress consists of:
Men:
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Formal kilt doublet in barathea or velvet. The regulation, Montrose, Sheriffmuir and Kenmore doublets are suitable in a variety of colours. Velvet is considered to be a more formal material. The Prince Charlie jacket (coatee) is considered to be less formal,[by whom?] although when introduced it was to be worn with a white lace jabot. Tartan jackets are also seen.
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Waistcoat in white marcella, tartan (usually to match the kilt), red or the same material as the doublet. No waistcoat is worn with the Kenmore or Montrose doublets.
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Kilt with formal kilt pin
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White stiff-front shirt with wing collar and white, gold, or silver studs and cufflinks for the Regulation doublet, or a white formal shirt and optional lace cuffs for the Montrose, Sheriffmuir, and Kenmore doublets
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White lace jabot. A black silk or a white marcella bow tie may be worn in place of the jabot with the regulation doublet (Highland wear often includes a black bow tie even at white-tie events).
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Black formal shoes or black buckle brogues
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Tartan or diced kilt hose
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Silk garter flashes or garter ties
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Silver-mounted sporran in fur, sealskin or hair with a silver chain belt
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Black, silver-mounted and jeweled sgian-dubh
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Highland bonnet (Balmoral or Glengarry) with crest badge (only worn outdoors)
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Short belted plaid with silver plaid brooch (optional)
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Scottish dirk (optional)
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