B.D.U. Pants:
Pants, Waist size in inches:
XSmall(23-27), Small(27-31), Medium(31-35), Large(35-39),
XLarge(39-43), 2XL(43-47), 3XL(47-51), 4XL(51-55), 5XL(55-59)

Flightsuits:
Chest size in inches:
Small(33-37), Medium(37-41), Large(41-45), XLarge(45-49),
2XL(49-53), 3XL(53-57), 4XL(57-61), 5XL(61-65)

Coveralls:
Chest size in inches:
Small(33-37), Medium(37-41), Large(41-44), XLarge(44-47),
2XL(47-50), 3XL(50-52), 4XL(52-54)

T-Shirts:
Chest size in inches:
XSmall(30-32), Small(33-35), Medium(36-38), Large(39-41),
XLarge(42-45), 2XL(46-49), 3XL(50-53), 4XL(54-57), 5XL(58-61)

Hats, Caps:
Head size in inches:
XSmall(Hat size 6 3/4, Head size 21 1/8"), Small(Hat size 7, Head size 21 7/8")
Medium(Hat size 7 1/4, Head size 22 5/8"), Large(Hat size 7 1/2, Head size 23 1/2)
XLarge(Hat size 7 3/4, Head size 24 3/8").

M-65 Field Jackets:
Chest size in inches:
Small(33-37), Medium(37-41), Large(41-45),
XLarge(45-49), 2XL(49-53), 3XL(53-57)

N-3B Parka:
Chest size in inches:
Small(42-43), Mediun(44-45), Large(46-47), XL(48-49),
2XL(50-51), 3XL(52-53), 4XL(54-55), 5XL(56-57)

Travel Vests:
Chest size in inches:
Small(36-38), Medium(39-41), Large(42-44),
XL(45-48), 2XL(49-52), 3XL(53-56)