The Unicorn Stuffy hat was a reward for those who played the game on launch day on the other platforms. The hat was ported to the Nintendo Switch version, but it's unused. The team could put it in Rux or the Reward-O-Tron if they want to make it unlockable.
That's right, that's how I got it on Xbox, but I'm now a Nintendo main and I play and prefer to play Plants Vs Zombies on Switch and on the go, I really want the Unicorn Stuffy hat on Switch, it's my favourite item in the game @imaPetalhead @EA_Shepard
Please EA and PopCap, please give us Nintendo Switch players the Unicorn Stuffy hat 🙏😁🙏
