One thing I find personally enjoyable about open sandbox games such as unturned is high level of customization. I love making my character look like an absolute bada**. I think it would be fun if weapon and player customization went deep. Keep in mind, these are very minor features and should be low on development priority.
It would be cool to have different clothing states. For example, wearing a cap either backwards or forwards, lifting or lowering your hoodies hood, changing the position of vest pockets on your vest, adjusting the rail position of weapon attachments, and so on. These are very minor details. I think it would be very fun to adjust these little things to your hearts content.
Once again, I know that these are very minor details. They don’t affect gameplay in any way except visually. I don’t expect these to be a development priority if these are added, but I think it would be a cool thing to consider for the future.