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DESCRIPTION: The classic CPO (Chief Petty Officer) Shirt originated almost 100 years ago, and has been widely appreciated ever since. It’s a jacket or a shirt, depending on what you need and what else you wear. Our CPO is an extremely versatile piece in a basic, historical design.

FIT GUIDE: Fitted- cut close to the body with minimal room for layering.
The male model in the photos is 5'11 - 184lbs wearing medium.

SIZE CHART

The male model in most of the photos is 5'11 - 184lbs wearing medium.

FABRIC: 100% WeatherWool Certified Fine Wool in a Denim Weave

FEATURES:

Signature slot button closures secured with nylon ribbon on cuffs, at the pockets, and front center
Milspec water-resistant thread throughout
Cut long for lower back and seat protection when sitting
Collar is substantial enough that if you fold it up, you will notice the extra warmth around your neck
Above the cuff is a 4-inch opening, secured by a button, offering good closure but also enabling the cuff to be comfortably folded up the forearm

WeatherWool is always MADE IN USA 100%

VERSATILITY: The CPO is typically a 2nd layer but is also often worn as a 3rd layer or base layer. Our Fabric is comfortable enough that the CPO can be worn directly on your skin, particularly on warmer, rainy days, but also in extreme cold when layering over top and you want the soft wool against your skin to cut the chill or reduce perspiration in mixed temperatures.

Predicting what garments will work for which people is always tricky because there are so many variables. For me (Ralph), the CPO is warm enough for active wear throughout the winter in New Jersey, in temperatures below freezing, with one or two light base layers.

The Denim has been surprisingly weather-resistant and crazy-tough. Make a great, hard-labour work shirt for mixed weather forecasts.

ANECDOTES: Some find the length of the CPO long when worn as a shirt rather than a jacket. Getting the CPO hemmed is simple and should cost no more than getting a pair of pants hemmed.

WeatherWool Advisor Leo Grizzaffi, the outdoor writer, likes to wear his CPO Shirt instead of a sport jacket.

The CPO also comes in our Jacquard-Weave,

SHIPPING: In-stock orders usually ship within 2 business days

OUT OF STOCK ITEMS: If your choice is out of stock, you have three optional next moves outside of picking something else.   

The best way to keep in touch with our production schedule is our NEWSLETTER. Sign up, and you'll always be up to date with what's coming down the pipeline.  

If it's only this one product you are interested in, click NOTIFY in the cart section, and we’ll get in touch before the next run.

  If the timeline isn't a concern and you know you absolutely want this exact item, place a Ship ASAP reservation for the next production. This guarantees you are locked in at the price, but please understand production timelines range anywhere from 1-3 years. 

CARE AND CLEANING: Wool’s anti-static properties help make it self-cleaning and odour-resistant, so it should not need frequent washing. It may not even need rare washing. If your wool does not seem dirty, don't feel obligated to clean it ... even if you have not cleaned it for years. More details about spot cleaning and submersion washing can be found on our care and cleaning page.

Quality Control Steps for the CPO

Care and Cleaning

02 July 2026 --- Cody

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