He steamed and pressed the fabric and got it looking straight again. I explained that if he doesn't take the time to do this, by the end of a day, his shirt will end up twisting no matter how much he has the cleaners press the shirt. It's ready to put the pattern pieces on.
My DH spent considerable time cutting out the pattern. I had him use weights and a rotary cutter. I forgot to warn him about the dangers of a rotary cutter. My thoughts were that as a wookworker he would know, since he uses razor blades all the time. He tried to guide the cutter with his finger and managed to take a tiny, tiny bit of skin off. Ouch! I believe people learn from their own mistakes. He did. I had to show him the safety button even though his drill has the same kind of thing. Association is not always evident.
He did an awesome job with the pieces ~ took his time and did the process with accuracy.
I am not going to have him make a complete shirt out of the muslin, but I am going to have him do the sleeve placket completely for practice. It's intimidating looking, but they do go together quite nicely.