I've made myself work overalls using this fantastic pattern from Wearing History.
I used a stretchy heavy weight denim that washes up great. I elongated the pockets an inch to fit my pens and phone.
I sectioned off one pocket to hold my work knife.
I also added some fancy lining to the waist band and pockets. I love this pattern. Both the overalls and the pants are roomy where I need them to be but still maintain that retro feel I love so much. Someone recently asked me why I make my work pants instead of just buying them like every one else at work. The only answer I could come up with was, "Because I can." What would you have answered?