The LayerLimits viewer lets you wear up to 60 wearables of any type. We've changed the logic for what limits are enforced on clothing worn by avatars: previously, we restricted avatars to 5 items for each type of removable clothing wearable such as shirts, pants, jackets, tattoos and alpha masks. With this viewer, we instead enforce a total limit of 60 wearables of all such types combined. So if you really want to you can wear 60 tattoos as long as you wear none of anything else.
These changes do not apply to body part wearables (skin, shape, hair, eyes), for which the limit is still one of each, and do not affect attachments, for which the limit is still 38 total.
Please submit bug reports for any problems encountered.