I cannot figure this out, and I've tried looking up the answer and I'm just not getting it? I've seen people hide their HA, and use various animals wearables, for example, with other items and a background. I tried vanishing cream but I can't use a background because it shows the white outline. Is there something I'm missing?

Only very recent backgrounds are full, without the HA cutout in them. Older backgrounds have a cutout where the HA would be, since they used to have to layer over the HA in the wardrobe, it was the only way the HA could show through.

Now though, the base layer is moveable in the beta wardrobe, so backgrounds are being drawn without the cutout in them. You have to use one of those to hide your HA without a cutout showing.

Oh, alright, thank you! I just recently started playing again so I did not know that.