Here you can find information about differnt sizes of jackets

Varsity jackets are available in a range of sizes, including standard letter sizes (XS to 6XL) and specialized cuts for different body types. Since sizing can vary between brands, it is best to consult a specific size chart with body measurements for the most accurate fit. 
Common varsity jacket sizes
The typical range of sizes for varsity jackets is extensive and often covers both unisex and gender-specific fits. 
Standard letter sizes: 
  • XXS, XS, S, M, L, XL, 2XL, 3XL, 4XL, 5XL, 6XL 
Specialized sizes: 
  • Tall: For taller individuals, many brands offer "Tall" or "XTALL" versions, which have additional length in the sleeves and torso.
  • Junior/Youth: Some brands also produce smaller jackets for kids and teens.