My black tie party trick.
Every gentleman at the wedding wore the same tuxedo shirt. Same black studs. Same everything. Start with the staple, then make it yours.

Start with SuitSupply.
SuitSupply is a great workhorse. The tux and the shirt everyone has. They're the base, not the look. Mine are Brunello or Ralph Lauren Purple Label.
Swap the black studs.
A vintage set: platinum, abalone or Mikimoto pearls.
Krementz · vintagePlatinum + abalone$329. Everyone else wore black.
Mikimoto · vintagePearl + onyxStuds and cufflinks, boxed.Pin a brooch on it.
Art Deco filigree platinum on a man's lapel. Mine came from The RealReal, under $1K.
ESEMCO · Art DecoPlatinum filigreeOld-cut diamonds. $595, forever.
Art DecoPlatinum + diamond0.38 ct.No one does a tux like Brunello.
Corduroy. Felted wool. Velvet. Fabrics nobody else puts on black tie. Same classic silhouette, totally different texture, and that's the whole point. That's tan corduroy Brunello up top. New with tags on eBay for about a fifth of retail, and over $500 eBay authenticates it.
Brunello CucinelliVelvet tux jacketNew with tags. $4,995 retail, $1,062 on eBay.
eBayBrunello Cucinelli Velvet Double-Breasted Tuxedo SuitNew with tags
eBayBrunello Cucinelli Cashmere-Blend Two-Tone Double-Breasted Tuxedo JacketNew with tagsFAQ
Is buying Brunello Cucinelli on eBay safe?
Over $500, eBay authenticates it.
Can men wear a brooch with a tuxedo?
Yes. Make it platinum and Art Deco.