Football Shirts: The Ultimate Sizing Guide

Buying football shirts can be surprisingly tricky—a size Medium in a replica kit fits completely differently from a Medium in an authentic player-issue kit or a classic 90s vintage jersey.

Here is a comprehensive breakdown to help you pick the perfect fit every time.

1. Authentic (Player Issue) vs. Replica (Stadium)

Most major brands (Nike, adidas, Puma) release two versions of every official shirt:

Feature Replica / Stadium Kit Authentic / Match / Player-Issue Kit
Intended Wearer Everyday fans, casual wear Professional athletes on pitch
Fit Type Standard / Relaxed Fit (Roomier around chest & waist) Slim / Athletic Fit (Tapered, hugs body closely)
Cut & Fabric Heavier, durable fabric; woven embroidered badges Lightweight, breathable, heat-transferred rubberized badges
Sizing Rule True to Size (TTS) Size UP by 1 size (Size UP by 2 for a loose fit)

Rule of Thumb: If you usually wear a Medium in normal t-shirts, buy a Medium in a Replica shirt, but bump up to a Large in an Authentic player-issue shirt.

2. Brand-by-Brand Sizing Breakdown

Nike

  • Replica (Stadium): True to size. Modern Nike shirts have a slightly tailored feel, but they still fit comfortably for everyday casual wear.

  • Authentic (Dri-FIT ADV): Very tight and form-fitting. Slim through the midsection and shoulders. Size up 1 size.

adidas

  • Replica (Fan Edition): Slightly boxy/generous fit compared to Nike. If you're between sizes, you can usually stick to the smaller size.

  • Authentic (HEAT.RDY): Streamlined and tapered around the waist. Size up 1 size.

Puma

  • Replica: Fits slightly slimmer than adidas, but generally true to size.

  • Authentic (ULTRAWEAVE): Extremely lightweight and ultra-slim fit. Size up 1 to 2 sizes depending on how snug you want it.

Castore, Hummel, Kappa & Macron

  • These brands tend to run significantly smaller than Nike/adidas across the board.

  • Kappa (especially vintage or Kombat kits) is notoriously tight—always size up 1–2 sizes.

  • Castore / Macron: Tends to have an athletic cut; if you prefer a relaxed fit, go 1 size up.

3. Vintage & Retro Shirt Sizing

  • 1990s Kits (Umbro, Nike, adidas): Oversized, boxy, and baggy with wider sleeves and dropped shoulders. A 90s Medium often fits like a modern Large or XL.

  • 2000s Kits: Transition period—early 00s (e.g., Nike total90) fits loose; late 2000s (e.g., Puma, Kappa) began moving toward skin-tight fits.

  • 2010s to Present: Standardized athletic and tailored cuts.

4. How to Measure Yourself Accurately

When ordering online or buying rare/vintage kits, ignore tag sizes and use a tape measure across these two key points (measuring a shirt you already own flat on a table):

  1. Pit-to-Pit (Chest Width): Measure straight across from the armpit seam on one side to the armpit seam on the other.

  2. Length: Measure from the highest point of the neck/shoulder seam down to the bottom hem.

Size Chest Measurement (Inches) Pit-to-Pit Flat (Inches / cm)
S 35" – 38" ~19" / 48–50 cm
M 38" – 41" ~21" / 52–54 cm
L 41" – 44" ~23" / 57–59 cm
XL 44" – 47" ~25" / 62–64 cm
2XL 47" – 50" ~27" / 67–69 cm

Quick Summary Tips

  • Casual / Streetwear Look: Choose Replica or Vintage kits in your standard size (or 1 size up for a trendy baggy look).

  • Long Sleeves: Long sleeve jerseys often have tighter cuffs/forearms; if you have longer arms or wider shoulders, consider sizing up.

  • Printing/Customization: Adding a player's name and number on the back stiffens the shirt slightly—make sure the shirt isn't tight across the back to avoid peeling or creasing the print.

Back to blog