I think that's just luck, mate, Fabric On Demand doesn't ever do any resizing, they just print the file you provide them with. Seems you're the size of the standard pattern. *shrug*
I feel bad because I get a LOT of people messaging me with questions about re-sizing and I've never been able to help them since I haven't really needed it and don't have experience adjusting sizes in photoshop. My proportions are similar to the base used by most pattern-makers, so I've always just asked for the file to be matched to my overall height and all of my suits have fit well.
I talked to MCL34N about it recently and he agreed that one of the problems is that the suit patterns aren't really designed to accommodate a wide-range of body types or heights. From the very beginning.
Most pattern makers are basing their work on the pelting layouts of the film suits, but the film suits are designed to match a very narrow range of heights for one principle actor and the handful of stunt performers who are chosen because of their similarly-sized frames. They are essentially tailor-made garments designed for one person's body, and the layout and proportions of the pieces are reverse-engineered from that person's physique. So if the pattern is used to fit somebody else's body well, much of the work has to be re-done from scratch, as any simple scaling fix will create a host of other fit issues. The "will fit people within this range of heights/weights" is kind of a myth, since the suit material should only have a little bit of tension in it at a resting body position, so that the stretch of the material can be utilized when the performer moves and contorts and climbs. If you stretch that same suit it onto a larger or taller person, a good deal of the material's stretch will be taken up just by fitting the user into the suit, and then little is left to allow them to move, and the surface details and fasteners are under a tremendous amount of strain. If used on a smaller person, the proportions will end up strange and there will be a lot of bunching and wrinkling.
There's no simple solution if we keep basing patterns off of one or two layouts from the film suits (the majority of patterns are still using the pelting layout from an old swiped "Spider-Man 2" file from 2003). The only way to guarantee a well-fitted suit is to design the original print file to match the physique of the client. Which is why hopefully there will be more trends towards sharing how to design a file for yourself, rather than how to make somebody else's file work ON you.
It will probably be a pretty steep learning curve (I'm just starting to discover a little bit about it, myself) but it would result in much better suits in the end.
Good luck.
