This is an old question, but it may help others; you can use the following code.
First check the customer.itpl.php or customer.itpl.php files located in ubercart/uc_order/templates .
Then you can edit the foreach loop, which resonates with all products and adds your own fields in this way:
<?php foreach ($order->products as $product) { $nid = ($product->nid); $noderef = node_load($nid); echo $product->title .' : '.$noderef->your_own_field[0]['value']; echo "<br />"; ?>
My Ubercart installation has product fields that can be edited from http://www.mysite.com/admin/content/node-type/product/fields .
You can find additional information about this issue .
akarpovsky
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