I want to make a doll with a wire armature, she's cloth, but I don't know how thick or what type to use. Thanks.
For a doll up to 22" a 16 (1/16") or 18 gauge wire is best. The same wire that other sculptors use is good for these dolls - aluminum. You can get this from various sources but a good brand is Almaloy. You may not find it locally but you can find it online. Aluminum wire is non-corrosive, fully pliable, and non-staining so it is great for use inside cloth doll bodies.
Hope this helps,