Clothing size comparison chart (garment technologist, grader, grading, patter cutter)

I am starting a UK clothing business and will be stocking products from a German manufacturer.

I would like to have produced a size comparison chart, comparing these German (EU?) sizes to size charts of other countries - UK, USA, etc. I would seek your advice on what countries we do compare against.

The size charts would be for Men & Women and include a full list of standard measurements - waist, hips, bust, chest, etc.

I am looking for someone with a good understanding of European and International clothing sizes to complete this project and not for someone to just pluck and compare randomly from existing charts on the net, that could be inaccurate.

The objective would be to produce an easy to understand guide, to assist the customer with their purchase.