I've never thought of this, and this is a good idea, although it confuses me how it would exactly work XD Since with the Preset Sync, you have to upload the preset in order for it to be seen, but it would be a bit odd with items. Also, since the items are meshes while the presets are ya know, presets it would probably be a bit weird o3o I'm no expert here, but I'm guessing that it would really be glitchy. Plus, since people can go and get other item packs instead of this as well, it wouldn't solve much. Most people get Pawsome Item Pack, and even though I was using Thierry's item pack I decided to switch to Pawsome since the majority of FH users use it. The only way he might be able to do this is if he changed FH so that if, for example you were wearing the first item on the list, let's say a Christmas Hat, someone else wouldn't see it as their first item, but I'm pretty sure that he would need the source code. Again, I'm no expert.
I'm kinda confusingly rambling here but I agree that it would be a great idea, but sadly probably not possible. If he makes this actually feel free people from the future to laugh at me