Taking advantage of the fact that you created the textures site, you could create another of the items.
For example, I always need to change my tori, but it is risky to spend tc on items that later do not look good on you.
So I thought of either creating a new site specifically for item, or adding items to the textures site.
Obs: And i mean, all 3D items and Hairs.

Umm, you can actually test items before buying them when using the ing shop.
I don't see the need for making a site to test items tho

For in game shop it would be nice to be able to equip more items at the same time, with colors and gradients and bloods, even textures maybe...

You can't test all of them, only a little part of them.
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Yes, ingame shop doesn't have almost none 3d item and hair for test

you can do it using the custom folder, and editing the differents files

And how exactly you edit the obj file?

2 choises:

1- Add all hairs and 3D items on the ToriShop
2- Add a flap on the ToribashTextures.com for testing all the items.

Hagan made the texture site and as far as I know isn't affiliated with Nabi, FYI, but just implementing in game item previews would be helpful, and if you want to go above and beyond Hagan can implement items on the site.