You could try GraalViewer, not official but it works
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I've been using it but it doesn't let you view pull frames and it isn't really the same, if you get what i mean. Sure you can see what everything looks like during various animations but it's not the same as actually controlling your character and being able to check everything out slowly. It is a nice handy site but unless you have the files for hats you can't check what they look like with heads and it doesn't suppot accessories full stop.
also as much as I use it, I don't 100% trust the site. I know that if I hosted a something with a bunch of stolen uploads and I had a viewer like that I would save everything people try out in the viewer and add them to the countless things already on there.
Also I've heard about using Testbed but I don't have a clue about how to go about it but I was suggesting something that if it were possible to do, everyone on iclassic would have easy access to it.