I find that some items preview right away while others take time XS This happening to you?

Yep, Now I can't see if things in Esther's shop are wearable or not -.-

It should show up, just hover over it for a while. :) It's just a little slow.

But yes, it's definitely taking a while on most items for me too.

I left my mouse over some of the wearables for 10 minutes and nothing.

Others loaded instantly.

I've been having this issue for a couple weeks now. :S

It's because they are cached. If you've loaded it before -- it will load instantly. If it's a new wearable for your avatar, it will take awhile to load.