Powershell - include relevant columns from other cmdlets?

Working with Powershell in Exchange, but I suspect the principle applies in any other Powershell area as well...

Question is: How can I include the OrganizationlUnit property (or any other property for that matter) from the initial "get-mailbox" output to be carried over as a column alongside the output of the piped "get-MailboxStatistics" cmdlet?

I cannot Select "OrganizationalUnit" or other Get-Mailbox properties with the piped "Get-MailboxStatistics" unfortunately.

Here is the code:

get-mailbox -OrganizationalUnit "cafenet.edu/Employees" -ResultSize Unlimited | Get-MailboxStatistics | Sort-object TotalItemSize -descending | Select DisplayName,@{label="TotalItemSize MB";expression={$_.TotalItemSize.Value.ToMB()}}

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If you want to use it later, out of order of the pipeline, then you have to store the value so that you can retrieve it later (using a variable).  Then you can add a calculated property with Select-Object.  See the following with some pseudo-code.
get-mailbox -OrganizationalUnit "cafenet.edu/Employees" -ResultSize Unlimited | ForEach `
    $prop = $_.someproperty
    $_ | Get-MailboxStatistics | Sort-object TotalItemSize -descending |
     Select DisplayName,@{label="TotalItemSize MB";expression={$_.TotalItemSize.Value.ToMB()}},@{n="SomeProperty";e={$prop}}

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