How to Tell If a Blazer Fits Properly (5-Point Check)

A well-fitting blazer has shoulder seams that end at your shoulder bone, closes without pulling at the button, and has sleeves short enough to show about half an inch of shirt cuff. Use this five-point check in the fitting room or at home.

1. Shoulders: The Fit a Tailor Can’t Easily Fix

The shoulder seam should sit right where your shoulder ends. If it hangs past the bone, the blazer is too big. If it pulls or creates a dent, it’s too small. Shoulders are the hardest part to alter, so get this right before you buy.

2. The Button Test

Fasten the top button. The fabric should lie flat. If it forms an X-shaped pull around the button, the blazer is too tight. If it bunches or gapes, it’s too loose.

3. Sleeve Length

With your arms relaxed, the sleeve should end around the wrist bone, showing roughly half an inch of shirt cuff. Sleeves are one of the easiest things to shorten, so don’t rule out a blazer only for this.

4. Jacket Length

The bottom hem should cover your seat or end around mid-hand when your arms hang at your sides. A blazer that’s too short looks cropped; too long makes your legs look shorter.

5. Chest and Back

You should be able to move your arms and cross them without the back pulling tight. Horizontal wrinkles across the back mean it’s too snug. A slightly loose chest is better than a tight one.

What a Tailor Can and Can’t Fix

• Easy: sleeve length, jacket length, slightly taking in the waist
• Harder: adjusting the back width or lapel position
• Very difficult: reshaping shoulders

Start with the shoulders, then check the rest. If the shoulders fit, almost everything else can be adjusted.