If it is going to look right, it will also have to be fitted to your measurements. I think most people make them themselves or have them custom-made by a seamstress/tailor who has done them before.
Museum Replicas have sold (do they still?) suits made from original patterns, so these would have the most accurate cut and stitching but that does not ensure that it would look good on you.
Some people have bought MR uniforms and had them altered by a tailor to their measurements, but that will not work for everybody. I am not so sure about the accuracy of the fabrics though. You may also want to have pockets added.
When choosing boots, do choose comfort over screen-accuracy.