Expected range of motion in a bodysuit?

I'm making a bodysuit for a commissioner, and it's my first time doing this for somebody else. We've opted to use measurements and cheap fabric rather than a DTD, to save on money (and hopefully, time). The suit design is a simple one with no padding, like this one.

My question is, how much is the range of motion that can generally be expected out of this type of bodysuit? My commissioner is wanting to raise his arms over his head without the suit tugging or wrinkling. But I warned him, fur is a non-stretch fabric so it will always have some degree of tugging... I'm asking here in case I'm wrong about this. I know that the fit depends on tailoring the pattern, and so far my pattern looks like this (minus the back of the body and the gussets that I plan to put in at the underarms and crotch):



So far, the wearer can comfortably raise his arms to about 30 degrees above his shoulder level without the fur tugging or pulling up very much, but he's concerned it won't be flexible enough. The way I see it, I could make the suit looser and it would impart more flexibility, but would also make it look baggier. Is that right? Or do I have to modify the pattern more?