Measure your chest
Wearing a comfortable t-shirt or shirt, measure all the way around your chest, just beneath your underarms. Insert a finger between your chest and the tape measure (about 1/2 an inch) for a comfortable fit.
This is your chest measurement, our recommended coat size should be the closest, but if it's not simply select the best fit from the other options.
Measure your waist
Take a pair of pants that fits you well, fasten the button and lay them on a flat surface with the button facing up. Measure flat across the waistband from side to side. Double the number.
This is your waist measurement, note it down and now do your inseam.
Measure your inseam
With the same pair of pants, lay them flat across the table with the top leg folded out of the way. Measure from the crotch to the bottom of the leg.
This is your inseam measurement, you're almost finished. The last size is your collar.
Measure your collar
Take a dress shirt that fits you well and lay the collar straight across, flat on a table. Measure from the center of the button to the center of the button hole.
This is your collar measurement, see the chart below for comparable sizes.