There are no specific itemization requirements as long is you give them sufficient information to reconcile the charges back to the account opening documentation.
1026.8(b) Nonsale credit. For each credit transaction not involving the sale of property or services, the creditor must disclose a brief identification of the transaction; the amount of the transaction; and at least one of the following dates: The date of the transaction, the date the transaction was debited to the consumer's account, or, if the consumer signed the credit document, the date appearing on the document. If an actual copy of the receipt or other credit document is provided and that copy shows the amount and at least one of the specified dates, the brief identification may be omitted.