The Reds are wearing 1990 throwback uniforms; no buttons, no belts

Reds wear sleeveless 1956 throwback jerseys

It's the Most Beautifully Curated Vintage & Couture to be Found – Shrimpton Couture

Vintage, Shirts, Red Bull Sauber Petronas Racing Button Up Race Jersey Shirt Vintage

What Men REALLY Wore In The 1950s

Looking For An Accurate Era Costume? Look no further! Take yourself back to the 70s in this groovy Men's Burgundy Leisure Suit, complete with brown-hued jacket and tan brown textured pants. And don't forget the blue button-up shirt—it's sartorial perfection! Make sure you've got all your ducks in a row by renting or purchasing- available in size small.

1970s Men, Burgundy Leisure Suit, BUY- S

Red pants, squatchees and cig pockets: Reviewing the finer points of the Reds' 15 throwback uniforms - The Athletic

A history of Mets home uniforms - Amazin' Avenue

Red Sox 90's Vintage Baseball Jersey by Majestic Made in USA – American Vintage Clothing Co.

Warren Beatty's White Suit in Reds » BAMF Style