Friends, I have a thing to say...
TEACH THE YOUNG PEOPLE IN YOUR LIFE HOW TO SEW! If you don't know how, find a friend or family member who'd be willing to teach them. Check out local rec center classes. Sign up at a fabric or craft shop. Get some books from the library and youtube that shit.
I think this is so important for all young people, especially girls. And let me tell you why. If you know me, you know I am not about that gender norms shit. "Oh sewing is only for girls. It's a female activity." 1. Miss me with that "female" bullshit. 2. Until I see men and boys running around buck ass nekkid with a full lion pelt tied around their bodies, sitting on rocks, sleeping on a bare bale of hay, you're not off the hook. You utilize sewn goods every day too and there's no reason you shouldn't be able to make what you use.
Here's the biggest reason I think sewing is mega important for girls...the fashion industry is not for us. Back in the 1950s, the hourglass shape and related proportions/measurements was the sizing standard and only 8% of women fell into that category. I'm not sure how something that doesn't accommodate 92% of the population it's supposed to serve is a standard, but hey, that's just me. Even now, there is no standard sizing guide (which you know, if you've ever been into a store and put clothes on your body). I have not met one man or boy who hasn't been able to run into a store and pick up a specific size pair of pants, NOT try them on and be good with their selection. Or worse yet, ask YOU to get them a pair of pants, armed with only a waist and inseam measurement and whatever you chose was fine (My husband asked me to do this, which caused me anxiety, swiftly followed by rage.)
Industry sizing "standards" aside, maybe the girls in your life want something different than what's out there. What the big head fashion people think everyone should want. If you want a princess dress with robots on it, more power to you sister! If you want the comfort of yoga pants, but not for the world to see your entire ass through cheap fabric, god bless you! Getting started can be pricey, and there's a lot to learn, but it is SO rewarding! There are definitely plenty of items that I will still buy (the money and effort that goes into making a tshirt that I could easily buy for $8 from Old Navy is not even worth it). But making a dress or pants that look amazing and fit like nothing off the rack is BADASS.