Letterman jacket sizes range from youth to adult 6XL, with options for custom sleeve and body lengths to ensure a perfect fit. Sizing is unisex and typically aligns with sweatshirt sizes, but adjustments are common to accommodate growth, layering, and personal style preferences.

Most letterman jackets are designed to fit slightly oversized, allowing room for movement and layering. This means a Medium in a varsity jacket may feel looser than a Medium hoodie. Standard sizes include XS to 6XL, and many manufacturers offer tall versions for longer torsos and arms. For example, a “Large Tall” adds about 2 inches to both body and sleeve length compared to a regular Large.

Youth sizing starts at 2T/3T and goes up to Youth XL, covering chest measurements from 20 to 31 inches. Adult sizing begins at XXS (26–28" chest) and extends to 6XL (66–68" chest), with sleeve lengths ranging from 28 to 38 inches. Women’s sizes are often listed separately, with chest and waist measurements tailored to female proportions, though most jackets are unisex.

To find the right size:

  • Measure your chest: Wrap a tape measure around the fullest part of your chest, under your arms.

  • Measure your sleeve: From the center of your neck to the wrist.

  • Compare to a sizing chart: Each brand may differ slightly, so check their specific chart.

Some brands allow custom alterations in 2-inch increments for sleeve or body length. This is especially helpful for athletes with broad shoulders or long arms, or for students who want a more tailored or oversized look.

Fit types vary:

  • Standard fit: Slightly boxy, traditional varsity silhouette.

  • Slim fit: More tailored, closer to the body.

  • Oversized fit: Drop shoulders and extra room, popular in streetwear.

If you're ordering as a freshman or sophomore, many schools recommend sizing up to accommodate growth over the next few years. Trying on a friend’s jacket or visiting a fitting event can help avoid sizing mistakes.

Ultimately, the right size balances comfort, style, and longevity. Whether you want a snug fit for layering or a roomy cut for casual wear, letterman jackets are designed to be adaptable and inclusive.