Please view pics for size is looked it up but may still be wrong.

This Christian Dior Men's Navy Plaid Blazer Jacket is a vintage piece crafted from 100% virgin wool, making it a luxurious and classic addition to any formal or business outfit. The jacket features a four-button sleeve button style, a peak lapel, and a single-breasted front with a two-button closure. With a chest size of 42 inches and a fit for a regular size 40, this blazer exudes a timeless designer vibe with a touch of retro appeal. Perfect for the winter, fall, or spring seasons, this blazer is sure to make a statement at any party, cocktail event, or formal occasion.