About this legitimate scaling question, the suit you've chosen is by default scaled for a 1m83 guy (6'). If you're 1m73 (5'8") and don't want to look like a squirrel in a spacesuit, you just have to compute for all file the folowing [default_scale_ratio x (173/183)] to you obtain your own scaling value.
Here the scale ratio is set to sommething like 25 ? Or whatever else, it's simply an unconcrete value that represents nothing you can mesure, but it's a value set for someone of 1m83. If you're smaller, this value must be smaller, by a proportionnal and linear factor. For a ratio of 25, your result will be near 23,64. Imput this value insted of the 25, click OK, then tweak the alignment of sheats borders by moving your 2D shapes if needed (paper templates will be smaller, but paper sheats's size remains the same, so you'll have the feeling that your templates have moved to the top left corner of the 2D view), and at last print your templates.
This is the basical way to operate. But if you know you have realy short legs and long arms, for example, you may want to take measurements on your body and specify a well matching ratio for each of your suit parts... I don't like this approach because IMO it breaks the harmony of proportions.
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Oh, and I'm 178, and did not rescale my mk4 suit. You may notice
from pictures that it'a bit too large. I don't like a suit to constrict me as tight as a coat of paint.