A long time ago, long before hormones, and before I became bald on top, my hair grew straight. When I became bald at age 19 I started shaving my hair and when I understood I am a woman at age 32 I started wearing wigs. (today I'm 38)
In the last year and 4 months I've stopped shaving my head and have been using wigs less and less in favor of my natural hair with a hat covering the bald part. I've noticed the new hair is wavy, and I love it because wavy looks so much more feminine to me than straight. After a shower it always becomes naturally wavy for some reason.
Could this be a change brought on by HRT?

Also, I think this is a much better solution than the previous one for me. Sure, it looks tom boyish to wear a hat, but I can make up for that with clothing choices and makeup and all the surgeries I did helped feminize my body and face. So now I can wear a wig, and when it gets uncomfortable, instead of having to grind through the discomfort to avoid dysphoria and misgendering, I just go to the nearest bathroom and switch to a hat. That way I can have the best of both worlds... look glorious with a wig while it is still comfortable, but once it gets too tight or itchy I switch to a hat and I still look feminine enough to pass most of the time, albeit in a less glamorous way.
And it's not just the physical discomfort itself, but the feeling of not being enough of a woman due to being constantly stuck in a situation where I have to choose between fighting my physical impulse to take off the wig vs. not wanting to feel dysphoria and be misgendered. It made me want to stay more at home and cut social interaction into chunks that would end before the discomfort becomes unbearable.

Just wanted to share that as another option for those struggling with wigs like I did. I still use wigs now, but more sparingly and in balance with other factors such as physical comfort and saving time and effort. My facial and body feminization plus learning to do better makeup definitely were essential for me to have this new flexibility. In fact, when I try to wear a "normal" colored wig, I seem to pass worse than I do with my own hair with a hat.