Knickerbocker Mfg

CPO Overshirt - Black Heavyweight Flannel

$155 $265

Free USA Shipping on orders over $100


With an emphasis on sustainability and transparency, the factory-born brand of Knickerbocker produces exceptional quality goods from their HQ in New York, as well as in partnership with a few specific factories from around the world.

This shirt was designed by Knickerbocker in NYC and then produced by Star Denim in Porto, Portugal. Star Denim is a small, family-owned garment factory with fewer than 20 employees. They specialize in manufacturing jeans, as their name implies, but produce other pieces as well, which are manufactured on the same machines, by the same specialists, as the jeans.

The CPO Overshirt is Knickerbocker's take on the frequently-iterated-upon CPO (aka Chief Petty Officer) shirt. It's got 3 pockets on the chest, that occupy the space two pockets usually would - two pockets on the left and one on the right. Said pockets have flaps which are held down by tonal black melamine buttons, the same buttons found on the rest of the shirt (including the cuffs).

Sewn up in a high-density, heavyweight 100% cotton flannel twill that has been washed for shrinkage. Makes for a great overshirt or midlayer, and when it's cool enough

Fits true to size. Pre-shrunk, so no shrinkage expected with a cold wash and hang dry.

  • 100% cotton
  • High-density heavyweight cotton flannel twill
  • Melamine cats eye buttons
  • Three chest pockets for the price of two
  • Overshirt fit
  • True to size
  • Custom label
  • Wash cold, hang dry
  • Made in Portugal

See how we measure - click here.

All measurements are in inches.

Model Gen wears a size Medium
Gen's sizing specs are:
6'1 and 180lbs
41" chest and 31" waist

Fits true to size. Pre-shrunk, so no shrinkage expected with a cold wash and hang dry.

Size Front Length Shoulder Chest Sleeve Length
Small 27" 18" 43" 25.375"
Medium 27.5" 19" 45" 25.5"
Large 28.5" 20" 47" 26.25"
Extra Large 29.5" 21" 49" 26.75"

Our Oakland and Santa Fe stores are open for cubside pickup. View our curbside pickup info.

Due to USPS service delays, we are shipping most USA orders via UPS Ground until further notice. If you prefer to have your order shipped with USPS, please contact us and we will do our best to accommodate you.

USA Orders

PPE and Bandannas under $100 - $3 via USPS First Class Mail
Curbside pickup: Free
Orders over $100 - Free shipping via UPS Ground
Orders under $100 - $8 shipping via UPS Ground
Expedited Shipping (1 - 2 business days) via UPS - $35

International Orders

Canada Shipping - Orders under $500
USPS First Class (10 - 15 business days)  - $15
USPS Priority Mail (5 - 10 business days) - $30
DHL Express (2-3 business days) - $40

Canada Shipping - Orders over $500
DHL Express (1-3 business days) - $40

Rest of World Shipping
DHL Express (2-4 business days) - $50

We want you to be comfortable shopping with us online without being able to touch the product. Before you purchase, please check the size charts we provide against your favorite garments.

  • Returns will be accepted on full-price items within 14 days of delivery (as verified by courier)
  • A restocking fee of $25 applies to all orders over $500 returned for a refund. The restocking fee does not apply to returns for store credit or exchange.
  • Items sold on sale or discount are final sale, no returns or exchanges.
  • Items must be in original condition with all tags attached.
  • Items that have been washed, hemmed, altered, excessivley worn, set aflame or touched by a private equity firm cannot be returned.
  • All return and exchange shipping costs are your responsibility
  • We will process all returns within 3 business days of receipt
  • Our team will acknowledge receipt and action take with your return
  • If you have questions at any time you can reach us at or use our contact form, or phone us at 510-373-9696.