finishing seams on wool trousers

You need an overlocker! Otherwise, zig zag is the only way unless the fabric is thin enough for a very narrow hem on each seam, which would probably be difficult to do and add extra bulk.

Could you use a fine seam edge binding on all the edges?

I'm not trying to teach my grandmother to suck eggs but have you checked for an overlock stitch on your machine? As even basic machines seem to have one.

I would use 'kick tape' and a herringbone stitch (by hand)

Thank you for the replies. My machine is a Brother, about 20 years old and can't see an overlock stitch. I think I will bind the edges. I used to do a lot of dressmaking but stopped when patterns became expensive and fabric shops closed down. I am looking on this project as a challenge!

Sorry if I'm a bit thick, but what is 'kick tape'.

It's a long time since I made a pair of wool trousers .

I recall handstitching some bias binding onto the crutch seams as the wearer said that the seams chafed !

Later , I extended the bias binding down the legs - but I love hand stitching and used to spend hours embroidering !

Are you on NextDoor
If yes, put a post up for a dressmaker. They will have an over locker. Shouldn’t cost much.

hong kong or bias bound seams

blog.closetcorepatterns.com/how-to-sew-hong-kong-and-bias-bound-seams/

you could make your own binding

Bind the seams in one very fine fabric like Liberty tana lawn or habotai silk in a toning colour. You can use the same fine fabric for the pocket bag. This will give a couture finish. Couture seamstresses would never use overlocking.