We are a throw-away society and part of our prepper training should be cloths maintenance.
This is a good article on all three of these skills. Worth a read.
http://www.thesurvivalistblog.net/clothing-maintenance-pre-post-shtf/I hate mending, mostly because my eyes are not good enough for the close work, but a manual sewing machine would be a welcome item in our equipment list. Even if it is nothing more than one of the simple hand stitchers (looks like a stapler, but has a needle and thread).
There are local classes on sewing, but all that I have seen, locally, cost some cash.