If you have solar to power a machine or a treadle machine, you'll want oil & proper machine needles for both (sizes 11-18 should take you through light cottons to heavy jeans), extra lightbulbs for the powered and belts for the treadle, at least a dozen bobbins so you don't have to unwind thread when you change colors. Keep every old pair of jeans for patches. Keep old sheets for quilt backing. You'll want patterns for men, women & children. Unless there's someone with experience, keep them simple: elastic waists or drawstring for pants and pull-on type tops. If there is an experienced sewing person, zippers and buttons. For a medium woman, plan on 3 yds of 45" wide fabric for pants, 2 for a short to 3/4 sleeve top. Save extra for quilts & repairs.
As to fabric, walk through a fabric store and feel the cloth. Stick with cottons, jerseys and wool. Less flammable & easier to wash/dry. You'll want light to medium stuff, maybe some heavy denim or duck for winter pants. Start with patterns and write down how much is required for making each item from scratch, depending on the sizes you'll need to make. Also note the fabric & thread recommendations and then go touch fabric. Look at your current wardrobes for additional thread colors to buy. Get 3 spools (2-3" high) of your most used colors for repairs and buy the recommended for each pattern. Unless specified by pattern go for a medium weight thread.
A couple of pairs of CLOTH ONLY scissors - go for the good German ones (Fiskars, etc). You can spring for expensive trimming scissors or get a couple of cuticle type small ones, they are good for cutting thread and close trimming if you are careful.
If you are hand sewing....good luck. Lots of needles from light to heavy and several thimbles.
