The suit details: Working cuffs and kissing buttons
Black Back Satin Sleeve Buttons Button Shank Tuxedo Suit Blazer Jacket Coat Tux | eBay
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Why are there buttons on suit jacket sleeves? Here's what they are for
ButtonMode Tuxedo Suit Button 15pc Set (Fits Most Formalwear) Includes 4 Jacket Front Buttons (19mm or 3/4 Inch) and 11 Sleeve and Pant Buttons (15mm or 5/8 Inch), Black Satin Smooth, 15-Buttons :
Men's Jacket Sleeve Buttons - Why Are They There? A Little Bit Of Menswear Style History - YouTube
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Why are there buttons on suit jacket sleeves? Here's what they are for