This is what I would do [not necessarily the correct answer!] IF you are happy with the side seam position:
Add 1" to the inside seam of the front part, tapering out to the crotch point as it is now. Remove 1" from the back part inside seam, tapering as above.
This will move the inside seam 1" backward.If you want to move the side seam forward - same procedure in reverse, take off front part, add to rear part.
Dont try and remake these - keep them for reference so you can see the changes and wear them around the house :-D
BTW - if you turn up the hem so its hanging freely you will get a better indication of the true fit.
Well add a large inlay on 1" on front and back - then quickly machine the 4 pieces together with a loose long stitch on your machine [with basting thread if you have it] press the center crease and then try them on before you do any more work to them.I made about 4 pairs of trousers when I started that had "spiral legs" the outside seam twisted in - it turned out the length of one pattern piece was 1/2" longer than the other. I was matching bottom middle and top notches and then pulling to get them to lie flat - when released this was creating a twist in the leg.
This is what I would do [not necessarily the correct answer!] IF you are happy with the side seam position:
Add 1" to the inside seam of the front part, tapering out to the crotch point as it is now. Remove 1" from the back part inside seam, tapering as above.
This will move the inside seam 1" backward. If you want to move the side seam forward - same procedure in reverse, take off front part, add to rear part.
Dont try and remake these - keep them for reference so you can see the changes and wear them around the house :-D
BTW - if you turn up the hem so its hanging freely you will get a better indication of the true fit.