Way to go, TampaPete - you got my issue on the first response. That pull-up cord might be used to tie his leg straps together, but if that's the case, he shouldn't leave all that slack hanging out loose to snag a pilot chute bridle.
All those other issues, wow, I had no idea. You guys caught stuff I hadn't even imagined! Amazing amount of knowledge, and sharp eyes, present here. Thanks for the learning experience.
The shirt seems tucked in to the leg straps very well, I don't really see that one as being a problem.