Interesting game, even if there's not much to do right now.
I downloaded it literally thirty* minutes ago, and I'm already done collecting all the items that are currently available.
* Technically, only twenty of those minutes were gameplay; the last ten have been writing this post.
I hope that, in a future update, progression and global multipliers won't be specifically tied to different cosmetic pieces needing to be worn and displayed. I like the sheep's appearance more than the cow's, but I can't sacrifice that tripled base income if I want to get anything unlocked in a timely manner; and the pumpkin hat just doesn't sit right with me, but the 2.5× multiplier it offers is crucial toward gaining emeralds for early-game progression.
Maybe if we're lucky, just owning the pieces will be enough... or maybe the dev will implement something where the pieces can be displayed in the background somehow while not needing to be worn—for example, the pumpkin hat could sit on an armor stand or something; and instead of writing on the sheep / cow, the felt marker could have writing on a wooden sign. Just my 2¢ is all.