In the field a simple sewing kit is IMHO pretty much a necessity.

A few stitches when a piece of clothing or gear is just starting to tear or show weakness saves a lot of trouble later. Regular needles are fine for most pack cloth and clothing. Sail-makers needles are triangular in cross-section and they go through multiple layers of material much easier. Leather working needles have a wider tip. Like a broad-head arrow.

You could carry a sail-makers palm to stitch leather and heavy materials but a pair of pliers, I generally carry a Leatherman that serves well in this role, and a thimble makes the job a lot easier without being nearly as bulky or heavy. A thimble is slower but your patching the equipment with a few well placed stitches not constructing it.

I would save the stitching palm for work at home or at a base camp.