Use manual focus. Make a best-guess setting. Then take the first three or four photos with the same pose, but inching forward a little each time.
Now check to see which position gave the best focus (e.g. for fine detail on tie and PS) and stand in that spot for all subsequent poses.
Another trick is to use narrow apertures (say f11 and higher) to give more depth of field. But you will need more light for this. Or you can up the ISO. Or decrease the shutter speed. Or get a better fucking camera.
p.s. with all this apparent expertise, I still take shite photos. Go figure.
Haha worst thing is, I took some photography lessons in school and not so long ago, but never tried self portraits. I need to read the owners manual again cause I don't remember how to set up a different f/number.
This jacket is fantastic!