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Measure from the stitches below the armpits on one side to another.
Measure from where the shoulder seam meets armhole to the cuff.
Measure from where the shoulder seam meets the collar to the hem.
Measure straight across the top of the waistband from edge to edge.
Measure from the bottom of the front rise to the top of the front rise.
Measure straight across the widest hip line from edge to edge.
Measured from the crotch seam to the top edge of the back waistband.
Measure across straight from the crotch seam to the outside of the leg.
Measure straight across the leg opening.
Measure the length from the crotch seam to the bottom of the leg.
Measure from the waistband to the leg opening or hem.
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It was initially issued to mechanics and engineers during WWII. During World War II, when used as a working cap for land mechanics, the flat and wide brim was a feature of the cap, which effectively shielded the sun. The simple yet functional design of the A-3 Cap grew in popularity, which led to it being used by other parts of the US Military.