Thanks for the replies. I didn't try to squat any further - but not because I didn't feel I could - I just didn't check full range properly. I might have to go try it on again...
It felt great apart from the knee bit - which didn't feel uncomfortable but I just wasn't sure if there should be any resistance at all there. Apparently not, from the replies. I wasn't wearing an undersuit.
I didn't check suspenders tightness - I can't remember feeling any pulling there but there was tightness in the bend - not bad tightness but it was there.
It definitely wasn't pulling on the neck seal - I didn't feel any tension anywhere except the knees. Yeah, I can't think of any time I'd be squatting in a suit but apparently that's how to check fit, so I'm told. I just didn't go the whole way down.
Thanks - I'll check the inseam of the suit. It's not one that I've bought (yet) - I'm just debating heavily because it's a brand new, great suit and made-to-measure, just not made to my measurements!
All that said, I'd eventually want to swap the boots for socks - does anyone have experience adding length with socks?