purchase Japanese construction clothing

I live in NY, and would like to purchase Japanese worker wear. I have researched it online mostly from Tobi.jp. I have friends who live in Japan, but I don't know how to convert my Us sizing into Japanese sizing.( 42 chest, 32 waist, 32 inseam, 9.5 foot, 5-11 height) Once I get the sizing correct, and find out where to purchase, my friends will get the items for me.

first convert your measurements from inches to centimetres (Japan, like most countries in the world, use the metric system). Then sent these mensurations to your friends. you can also have a look at http://www.onlineconversion.com/clothing_mens.htm