This is the size chart we try to use for our Army Surplus Uniforms.
 
Pants
small 27"-30" waist
medium 31"-34"
large 35"-38"
xlarge 39"-42"
2xlarge 43"-47"
 
Shirt/Jackets/Coats/Parkas
Small 34"-37" chest
Medium 38"-41"
Large 42"-45"
XLarge 46"-49"
2XLarge 50"-53"
Reproduction Jacket and Tunic Sizes*
U.S.        Generic        Centimeters
34                XS                    86
36                S                      92
38                M                      96
40                M                      102
42                L                      106
44                L                      112
46                XL                    117
48                XL                    122
50                XXL                  127
52                XXL                  132
54                XXXL                137
56                XXXL                142
58                XXXXL              147
60                XXXXL              152 
 
For the Sturm (German) Sizes The Centimeters are halfed.
*Measured around the chest, just under the armpits.
Hat sizes 
U.S.           Inches*           Centimeters
6 7/8           21 5/8"              55
7                  22 1/8"              56
7 1/8           22 1/2"              57
7 1/4           22 7/8"              58
7 3/8           23 1/4"              59
7 1/2           23 5/8"              60
7 5/8           24 1/8"              61
7 3/4           24 3/8"              62
7 7/8           24 7/8"              63
 
*Measured around the largest part of the head, just above the eyebrows and across the temples.
Men's Shoe Sizes 
U.S.           European           U.K.
6                    38                     5
7                    39.5                  6
8                    41                      7
9                    42                      8
10                  43                      9
11                  44                     10
12                  45                     11
13                  46                     12
14                  47                     13
 
Note, this is the Standard Generic International Size Conversion Chart that should be used for a guideline only. Currently, there is no set agreed upon standard conversion and you may find that many charts available differ slightly by a 1/2 size.
GLOVE FIT
 
Use the following measurements to determine correct glove size. NOTE: Use the longest finger-length or hand-width measurement to find your accurate glove size in the below charts. If your longest measurement falls between sizes, order the larger glove size.
 
Width Measurement: Wrap a tailor's measuring tape around your dominant hand just below knuckles, excluding your thumb, and make a fist. This measurement is your hand width glove size.
 
7 1/2 -7 3/4 inches (180-195mm) = M
8 - 8 3/8 inches (200-215mm) = L
8 1/2 - 9inches (220-230mm) = XL
 
 
Length Measurement: Measure from bottom edge of palm to the tip of your middle finger to determine your finger-length size.
 
7 inches (175-185mm) = M
7 1/2 inches (190-195mm) = L
8 inches (200-205mm) = XL