Now I didn't do the nifty "triangle" pocket openings as in the period pockets. I just did a straight cut.
I sew my pockets in outer front pieces first, then I'll construct the rest of the outer shell.
This makes it possible to tuck the linings inside the garment.
Check these out.
Now when you sew the linings in, I sew them on the outside and push them through to the inside. Vintage Pocket making
This is a website I used as a guide. Not necessarily PC but it gave me the right idea.
Hope this helps.