Toddler Through Grand Canyon

Regarding layers… We’ve bought mostly Patagonia clothing for our 1, 1, and 2 year olds that we take hiking with us.  Price is a big consideration with kids clothing, but if you buy used or on sale you can usually sell it for the same price you bought it for.  Patagonia has everything from base layers, fleece, puffy, and rain jackets that mostly match their adult products.  I think REI has some nice offerings for kids as well.

I have twins (now 14) but we did well with Lands End and LL Bean.

Here is my 2 cents.  Check cloths opinions with your significant other before committing to a direction.  I say this because when we took our girls to to the Bright Angel, I planned out the clothing only to be overcalled by my SO as she was worried that the kids would get cold.  Reduce your stress and get buyoff first.

For a tethering system, a quick google search says kids climbing harnesses are fairly cheap. Should be comfortable enough for her, hard to get out of. Add an appropriate length of rope spec’d for her weight and you should be good to go. Just have to pick a secure point on you or your equipment for the other end.