How to Calculate Your Size: Blazers/Sport Coats and Pants

How to Measure Yourself for Blazers (or Sport Coats):

Take a measuring tape and wrap it around thefullest part of your chest (under your armpits). If you measure 40 inches around your chest, then your chest size is 40 inches and, likewise, your suit jacket size is 40. 

The letter after the jacket size is thelength of your jacket (both body and sleeve). Your options are short (S), regular (R), long (L), or extra long (XL).

Generally, a "short" is suitable for people 5’8” and shorter; a "regular" is good for individuals 5’9” - 6’ feet tall; between 6’1” and 6’4” is considered "long;" people 6’5” and taller need "extra long."

man wearing medium gray stylish blazer

How to Measure Your Pants Size: 

Do not base your dress pant size on your jeans size. Why? Jeans and casual pants are "vanity sized" (not to mention the fabric has more stretch). Just because pants claim they are a size 34 does not mean they actually measure 34 inches around.

The best thing is to physically measure the waistband of a pair ofdress pantsor slacks that fit you well and sit at your waist (not lower, like jeans are often worn). If you don’t have dress pants,measure your actualwaist (just above where you’d wear your belt).

The measurement of your waist or the waistband of your favorite dress pants is yourpant size. If your waist is 34 inches around, your pant size is 34 or 34W (W stands for waist).

man wearing dark grey flat front suit pants

Options for Tailoring

Manufacturers often, but not always, think ahead and include extra fabric at the waist and seat in case the pant needs to be let out (or taken in) up to two additional inches.

Pants also come with aninseam measurement. This represents the inner seam of the pant leg, from the seat seam below the zipper down to the bottom hem. Pants can be purchased unhemmed or pre-hemmed -- in this case, it will have two numbers separated by an ‘x’ (e.g. 34x32). That second number is your inseam.

In traditional men’s tailoring, most dress pants should hit the back of your dress shoe and have a small break in the front.

More Men's Suit Guides: 

Antonio Rossi

Antonio Rossi

2 Responses

Antonio Rossi

Antonio Rossi

November 02, 2021

These days, longs are measured (back of the collar to the hem) at around 29.5". But this is a vintage sport coat and styles change over time. As such, I’d most likely list it as a 42L. To be sure and double check your work, I would measure the sleeve length as well: a ‘short’ will measure up to 25.2", a ‘regular’ will measure up to 26", and a ‘long’ will usually be around 26.8" (or longer). Thanks for the question and good luck!

Karol Holiday

Karol Holiday

November 02, 2021

I have a nice vintage sport coat that I want to list on eBay but there is no size tag. I measured it, and the chest measurement (armpit to armpit) is 21" so, that means 42 if doubled. The length (from below the collar to the hem on the back) is 32"…. so would I advertise this as a 42 R? Thanks in advance! Karol

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