Herringbone, also called broken twill weave, describes a distinctive V-shaped weaving pattern usually found in twill fabric. It is distinguished from a plain chevron by the break at reversal, which makes it resemble a broken zigzag. The pattern is called herringbone because it resembles the skeleton of a herring fish. Herringbone-patterned fabric is usually wool, and is one of the most popular cloths used for suits and outerwear. Tweed cloth is often woven with a herringbone pattern.
Extrait de: Herringbone (cloth), Wikipedia [en]
Fatigue uniforms made from cotton in this weave were used by several militaries during and after World War II; in US use, they were often called HBTs.
Additionally, a fatigue-duty uniform made of 8.2-ounce heavy cotton herringbone twill (HBT) cloth was issued. The uniform consisted of a shirt, trousers, and a hat. Initially, this was a circular-brimmed « clamdigger »-style hat which was later replaced by a billed cap that was based on a design used by railroad workers. It was intended to be worn over the basic wool or cotton uniforms to provide protection during fatigue duties, but it proved to be much better material than the primary wool uniform for hot weather, as so it saw use as a combat uniform in nearly all of the major theaters of combat in which the US was involved.
Extrait de: United States Army uniforms in World War II, Wikipedia [en]
The original 1941 version came in a light sage green color that faded with repeated washing. The later 1943 version had small changes in tailoring and came in a darker olive drab shade No. 7, matching the new M-1943 version of the field jacket.
Jackets
Spec No. 45
Pre-war design, light OD, waist adjusting tabs, no gas flap, hem band, no provision for attaching a hood, small pockets with ‘cut off corners’
Spec No. 45B
1942 design, light OD, expanding cargo pockets on the chest, no hem band, no gas flap, no provision for attaching a hood, no waist adjusting tabsSpec No. 45B (Special)
Same spec as Spec No. 45B but with gas flap and buttons to attach hoodSpec No. 45D
1943, same as Spec No. 45B (Special) but now in OD7, variations of pocket pleats have been observed with different makers (In my opinion the pleats were a variation, not a new pattern. It seems the choice of pleat was optional for manufacturers)Spec No. 375 (Camo HBT)
Resembles Spec No. 45D, hidden buttons, reinforced elbows, pockets on green sideSpec No. 45E
Basically the same as Spec No. 45D but with simplified pockets (smaller size, squared or ‘cut off corner’ design), has small pencil sleeve inside pocket, very late introduction date (if issued at all during WWII)
TrousersSpec No. 6-254 (same as trousers, cotton, khaki)
Pre-war design, light OD, white lining, no thigh pockets, ‘narrow’ shapeSpec No. 42A (1942) and 42C (3/10/43)
Light OD, expanding thigh pockets, gas flap, ‘baggy’ shapeSpec No. 42C (OD7) with revision 1/15/44 (Spec P.Q.D. No. 339, P.O. No. 3954)
Same as Spec No. 42A and 42C but in OD7, variations in pocket pleats (middle/rear pleat)Spec 374 (6/3/44)
Extrait de: The ABCs of Collecting WWII Army Issued HBT Clothing
Camo trousers, 1943, ankle tabs, hidden buttons (except waist), knee patches
Combinaisons
Trois types de combinaisons HBT se sont succédées:
- M1938 Suits Working One-Piece HBT
1er modèle de combinaison de travail réalisé en toile de coton HBT
Federal Specification No. BBB-S-786
Numéros de stock: 55-S-49846-30 à 55-S-49888 - M1942 Suits Herringbone Twill One-Piece Special
2ème modèle de combinaison de travail réalisée en toile de coton HBT de couleur OD 3
Specification P.Q.D. No. 92C et 92E
Numéros de stock: 55-S-45841 à 55-S-45890 - M1943 Suits Herringbone Twill One-Piece O.D. 7 Special
Dernier modèle de combinaison de travail réalisé en toile de coton HBT de couleur OD 7
Specification P.Q.D. No. 92F
Numéros de stock: 55-S-45525 à 55-S-45580

Bibliographie
- WINDROW, Richard & Tim HAWKINS (1993) The World War II GI US Army Uniforms 1941-1945 in Color Photographs. The Crowood Press, 145 p.
Webographie
- DELAVALLÉE, Gérard (2020) usarmydatadepot.com
- RAMBOB (2013-06-20) The ABCs of Collecting WWII Army Issued HBT Clothing [discussion] U.S. Militaria Forum
- Herringbone (cloth), Wikipedia [en]
- United States Army uniforms in World War II, Wikipedia [en]