Sunday, January 18, 2026

Don't Waste Your Money! The Ultimate NBA Jersey Sizing Guide 2026 (Nike vs. Mitchell & Ness)

[As an Amazon Associate I earn from qualifying purchases.]

Buying an NBA jersey is an investment. Whether you are dropping $110 on a Nike Swingman or $300 on an Authentic Mitchell & Ness, the last thing you want is a jersey that fits like a dress or is too tight to breathe in.

The problem? Not all NBA jerseys fit the same.

A "Large" in Nike is completely different from a "Large" in Mitchell & Ness.

In this guide, I will break down the differences between the brands, explain the "Swingman vs. Authentic" confusion, and help you pick the perfect size for yourself or as a gift.


1. The Golden Rule: Know the Brand

First, check who makes the jersey. This determines everything.

A. Nike (Current Players)

  • The Fit: Modern, athletic, and slim-cut. They are designed to sit closer to the body.
  • The Sizing: They use a number system (40, 44, 48) alongside S/M/L.
  • Recommendation: If you like a loose, streetwear look (or plan to wear a hoodie underneath), SIZE UP. If you buy your normal T-shirt size, it might feel tight around the chest.

B. Mitchell & Ness (Legends/Retro)

  • The Fit: Classic, boxy, and wider. These are replicas of jerseys from the 90s and 2000s.
  • The Sizing: Standard S/M/L sizing.
  • Recommendation: These run True to Size. Do not size up unless you want a very baggy "90s Hip-Hop" look.

2. Swingman vs. Authentic: What is the difference?

You will see these two words everywhere on Amazon. Here is the simple difference:

Feature Swingman (Fan Favorite) Authentic (Pro Deal)
Price Affordable ($110 range) Expensive ($200+)
Material Mesh fabric (Dri-Fit) Premium, heavier fabric
Numbers Heat-pressed (Glued on) Stitched (Sewn on)
Fit Standard Fit Performance Fit (Longer)
Best For Casual wear, Gifts Collectors, Die-hard fans
My Advice: For 90% of fans, the Swingman is the best choice. It’s comfortable, looks great, and is easier to wash.

3. Detailed Size Chart (Chest Width)

Use this quick reference before you click "Buy Now."

Size Nike Swingman (Slimmer) Mitchell & Ness (Boxier)
Small (S)40 (37.5" Chest)36-38" Chest
Medium (M)44 (41" Chest)39-41" Chest
Large (L)48 (44" Chest)42-44" Chest
XL52 (48" Chest)45-47" Chest
XXL56 (52" Chest)48-50" Chest

4. Top Picks on Amazon (2026 Edition)

Here are the best-selling jerseys for every type of fan.

For the "Old School" Fan (90s Nostalgia)

Nothing beats a classic Bulls or Lakers jersey.

For the "Modern" Fan (Current Stars)


5. Summary Checklist

  1. Nike = Runs small. Size UP for comfort.
  2. Mitchell & Ness = Runs true/big. Stick to your normal size.
  3. Swingman is the best value for money.
  4. Authentic is for serious collectors who want stitched numbers.

Wait! Is your look complete?

A jersey looks best with the matching hat. If you haven't figured out your hat size yet, check out my previous guide:

📖 Stop Guessing! The Ultimate NBA Hat Sizing Guide

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