Just incase any missed it, and subsequent question for anyone who already prepurchased -

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  • In-game items and Character Boost not available in World of Warcraft® Classic, and Character Boost usable only on the WoW game account on which it was purchased or redeemed as a gift

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So you cant buy the xpac on account 1, and then boost account 2...

Has anyone purchased the xpac already and checked if you can use the transmog from the prepurchase on your other accounts toons?