iC8 either has export issue, and/or import issue, of Alembic
(1) I exported a clothing animation, with no poke through issues, from iC8 out as Alembic (2) To test, when imported back into iC8, Alembic did not then exactly match the character's shape, per-frame on the same animation.
The character mesh now had poke through as part of the Alembic (skin below shirt and skirt below apron)
