I keep a cute little basket with all my apron patterns by the cutting table, making it easy to grab the one I want to work on.
The muslin pattern is carefully placed on top of the fabric and using it as a guide, I cut the apron out using a rotary cutter. The muslin doesn't shift on the fabric making it ideal as a pattern guide.
After I've cut a batch of aprons from the same fabric, I decide whether I am going to sew them up or bag them (Ziploc again, I should get a commission for promoting them so often) to sew up at a later date.
Plastic bins hold all of my pre-cut aprons until its time for me to sew them up. And there you have it, behind the scenes of apron prep.