As title suggests, flower crowns dont appear on your player character when in the head curio slot, only in the armor slot.
1.18.2 forge
version 3.0.2

Can reproduce on this environment:
Minecraft 1.19.2
Fabric 0.14.11
Fabric API 0.69.0
Immersive Weathering 1.2.5
Trinkets 3.4.1

^ same here
Fabric 0.14.17
Immersive Weathering 1.2.8
Trinkets 3.4.2
This is my favourite head-piece <3 pls pls pls fix it to show up when placed in Trinket head slot. It's imperative that I look like a pretty fairy when i go into battle. Sorry if this is a silly question bc i can't actually read the .class files but did you register it so it extends TrinketItem?

Edit: I've asked around and it seems that it's just an issue of rendering support. I hope that helps! My whole server is now loving this flower crown & wants to wear it when we're raiding, so i did my best to help diagnose the issue in hopes of expediting a fix ^_^