Socks are the gateway drug to buying Made in the USA clothes. There are lots of opportunities, with many companies that manufacture socks in America.
Wigwam socks are great, a go-to for a thick warm winter sock, and I think they have lots of other types.
Another option is Smartwool. I used to see imported Smartwool socks, but lately I have checked and most of the Smartwool I see has “Made in the USA” on the label.
I’ve been wearing Thorlo running socks and they are so comfortable.
For the Baxter hiking trip I purchased two pairs of wicking liner socks from Fox River, but as I recall not all of their socks are made in the USA so be sure to check.
Lamey Wellehan shoe stores across Maine carry many of these brands.
So, it may be hard to get into wearing made in the USA from head to toe, but jumping in feet first is easy.