As I said in the video, its nice and snug around the waist and hips, and takes a little work to get into. I was wearing some thin wool undergarments, which seem to be enough for the 72 degree waters in Florida caves. Around the arms and legs, fit is fine. I can't imagine that you can get the legs really small because you have to fit your foot through (and knee pads, and pockets), but it doesn't leave a huge amount of extra material. Arms are also likely limited by having the oval cuff ring system, so I can't really blame practicality on something like that.
If the snugness (and its a gentle snugness, not an uncomfortable tightness) becomes an issue if/when I need thicker undergarments, I might attempt to gently stretch it overnight. I doubt it will be an issue, and even if it is, I bet it will stretch a smidge over time. In the meantime, I'm incredibly happy diving this.
Also, final little note, the feet fit well, but are snug inside my wetsuit booties. Totally fine for now, but I wouldn't be super-surprised if they got numb after 4+ hours or something. Obviously the wetsuit booties were sized to my foot without neoprene socks, but its totally a viable option for the time being.
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Why does your inflator valve seem to be rather low on your chest?