Military Fatigue Pants: OG 107, BDU, and What to Know

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Two uniform standards account for nearly every pair of military fatigue pants you will see in the surplus market: OG 107 and BDU. They are not interchangeable. They were issued in different eras, built from different fabrics, cut to different patterns, and made for different operational thinking. If you are shopping for a pair of military fatigue pants for collecting, reenacting, work wear, or just daily wear, knowing which one you actually want is the first decision.

This guide walks through both: what they are, how they differ, what to look for when buying surplus or vintage stock, and how the modern military style pants on the market relate to the originals.

OG 107: The Standard From 1952 Through the 1980s

OG 107 is a shade designation that became the name of an entire uniform family. Adopted by the US Army in 1952 and worn through the late 1980s, the OG 107 utility uniform was the daily work uniform for an entire generation of soldiers, including the bulk of the Vietnam era. The trousers were cut with a high waist, traditional button fly, and either four pockets (early issue) or six pockets in the jungle fatigue tropical weight version.

Two fabrics dominated the OG 107 lineage. Cotton sateen was the heavier weight used for the standard utility uniform, and cotton poplin was the lighter, more breathable tropical weight used for hot weather and jungle issue. The OG 107 designation lasted until the BDU replaced it as the standard work uniform at the end of the 1980s.

BDU: The Battle Dress Replacement

The Battle Dress Uniform took over from OG 107 starting in 1981 and became the standard US military work uniform until the mid 2000s. BDU pants are immediately distinguishable from OG 107 trousers by the camouflage patterning and the six-pocket layout, including two thigh cargo pockets that became the signature feature.

BDU came in a sequence of patterns as the US military adapted to different operating environments: M81 Woodland (the classic green and brown four color), ERDL (the predecessor Vietnam era leaf pattern that informed Woodland), three color Desert, six color Desert ("chocolate chip" of the Gulf War era), and several specialty camouflage variants. Fabric was typically a 50/50 nylon cotton ripstop or 100 percent cotton ripstop depending on the issue period.

OG 107 vs BDU

If you are weighing one against the other, the practical differences come down to era and use case. OG 107 trousers have the cleaner solid color profile and the older silhouette that collectors prize for Vietnam reenactments and vintage workwear. BDU pants have the camouflage, the cargo pockets, and the ripstop fabric that most modern outdoor and tactical users expect.

Neither is objectively better. OG 107 wears like classic field clothing; BDU wears like modern combat clothing. The right choice is the one matched to your intent.

Modern Use Cases

Military fatigue pants are popular with several civilian audiences. Vietnam through Cold War reenactors need OG 107 for accuracy. Hunters and outdoor users gravitate toward BDU for the cargo pockets and the ripstop construction. Workwear shoppers buy both for the durability to price ratio. Collectors of US military uniform history target specific issue periods, contractors, and patterns within each family.

What to Look For When Buying

Surplus and vintage stock varies widely. Run through this checklist before you commit to a pair.

Authentic GI issue vs commercial production vs reproduction. GI issue surplus is the most expensive and the most collectible; commercial vintage stock (such as our SWI vintage OG 107 trousers) is built to the pattern but was not government issued; reproduction stock is modern production with no vintage value.
Era markings. Look for date stamps, NSN labels, and contractor labels on authentic GI issue. Their absence is not necessarily a problem on commercial vintage stock, but it does change the price you should pay.
Fabric weight. Cotton sateen and cotton poplin feel very different on the body. Confirm which fabric the listing describes before you order.
Pocket count and layout. Four pocket vs six pocket vs cargo pocket configurations vary across the OG 107 and BDU lineages.
Sizing and fit. Military sizes generally run a half to one full size larger than civilian sizing of the same number. Vintage stock often has gaps in available sizes; check stock before committing to a specific fit.
Condition grading. New in package is rare and worth the premium; new with storage marks is the most common condition for vintage stock and typically only affects appearance, not function.

Frequently Asked Questions

What is the difference between OG 107 and BDU?

OG 107 was the US Army utility uniform from 1952 through the late 1980s, in solid olive green with either a four pocket or six pocket layout in cotton sateen or cotton poplin. BDU replaced it starting in 1981, came in camouflage patterns, and added two thigh cargo pockets for a six pocket total in nylon cotton ripstop or 100 percent cotton ripstop. Browse both families in our authentic military pants collection.

What does OG 107 stand for?

OG 107 is the US Army color designation for Olive Green Shade 107, the solid color used on the standard utility uniform from 1952 through the late 1980s. The designation became the common name for the entire uniform family.

What does BDU stand for?

BDU stands for Battle Dress Uniform, the camouflage work uniform that replaced OG 107 as the US military standard issue starting in 1981 and stayed in service until the mid 2000s. BDU came in several patterns including M81 Woodland, ERDL, and three and six color Desert. See our Woodland BDU Pants vs ERDL Camo blog for the pattern lineage.

When was OG 107 used by the US military?

OG 107 was the standard US Army utility uniform from 1952 through the late 1980s, when BDU took over. It was the day to day uniform for an entire generation of soldiers, including most of the Vietnam War era.

Are OG 107 pants and BDU pants the same fit?

No. OG 107 pants are cut with a higher waist, traditional button fly, and either four or six pockets depending on issue period. BDU pants are cut for over field gear use with a relaxed fit, button fly, and six pockets including two prominent thigh cargo pockets.

Can I still buy authentic GI fatigue pants?

Yes. Both authentic US Government Issue surplus and vintage commercial production from era contractors remain available. Authentic GI surplus carries a premium; vintage commercial production (such as our Vintage US Made SWI OG 107 Hot Weather Trousers) is cut to the same pattern but was produced for the civilian market, not the US government.

How do I tell if my fatigue pants are vintage or reproduction?

Look for date stamps, contractor labels, and NSN tags on authentic GI surplus. Vintage commercial production typically has the original maker's label and storage marks consistent with new old stock. Modern reproductions carry current production tags and zero patina.

What fabric are OG 107 pants made of?

Two fabrics dominate the OG 107 lineage. Cotton sateen was the heavier weight used for the standard utility uniform, and cotton poplin was the lighter, more breathable tropical weight used for hot weather and jungle issue.

Shop Military Fatigue Pants at Army Navy Sales

Browse our full authentic military pants collection for current production fatigues, vintage stock, and BDU variants across multiple patterns and eras. A few highlights:

US Made Fatigue Pants OD Green: current production military style fatigue pants with brass zipper and four pocket layout, modeled after OG 107 utility cut.
Vintage US Made SWI OG 107 Hot Weather Trousers: vintage commercial production cut to the OG 107 tropical pattern, 100 percent cotton poplin, new old stock from SWI's own production run.
100 percent Cotton Ripstop Military Spec BDU Pants: current production BDU style in 100 percent cotton ripstop.
GI Desert Storm 6 Color BDU Pants: authentic Gulf War era six color desert BDU.
US Spec Woodland ERDL BDU Pants: BDU pattern with the Vietnam era ERDL leaf base.
Vintage US Made 100 percent Cotton Tiger Stripe Pants: vintage commercial production in the Vietnam era tiger stripe pattern.
6 Pack of GI Vietnam Era Uniform OG 107 Buttons: original replacement buttons for OG 107 uniform repair and restoration.