As most of us are aware the C22 head is a bit small for the wig provided with some of the dolls, my Isabella 100 (retired), Ana 125 and Ana 140 have experience this issue, i tried adjusting the wigs as tight as possible and it help but did not solve the problem i was thinking about buying some wig tape but remember reading on a post the option to buy a child size wig, well those are not as easy to find but i finally got one and it fits so much better, it actually puts pressure on the head and does not seem to move around like the regular size wigs. I know putting a larger head is an option but it may seem a little to large for the body proportions and besides that C22 is a cutie!
I will be testing this new wig out and put it true the paces and report back the findings, Ana 125 will be my lab partner and to see if it holds up we will be subjecting it to the appropriate positions such as the wheelbarrow, reverse waterfall, tilted bridge, bucking cow girl, etc... if the wig stays in place with these then it will be a passing grade.
On top original wig, bottom new wig

It is a little difficult to see from the picture but the original (right) is adjusted to the maximum tightness and the new (left) to the maximum looseness yet they have about the same diameter.

I use these Nylon Wig Caps, I bought off Amazon, with any Wigs I have, that have those Black Net Wig Caps, to prevent the TPE from being stained...