Is it possible for hair texture to change?

I’ve had straight hair my whole life. However, about 4 months ago, I started noticing that my hair turned “wavy”. It’s now wavy straight. Some hair strands are straight while others are wavy. It looks nice, but I’m not sure why my texture changed. This has happened to a few of my family members and I’m not sure why. Thoughts?

PS- I haven’t used any curling tools or hair rollers in 6 months.

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Thanks for the opinions, guys. I’d really appreciate some opinions from women though. Thanks!
Is it possible for hair texture to change?
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