I cannot recommend the Moon Machines series enough. There was a whole 45-minute episode just on the space suit; it goes over in detail the how & why Playtex got the contract. It's got interviews with people who worked on the project, testing footage I've never seen elsewhere, and some great anecdotes as well. It really gets down into the nitty-gritty design challenges they faced -- it's the Apollo program as the engineers saw it, not the astronauts.