One more sorting type: by custom field

[Loris]

Hi guys,
I know that actually VM2 can sort product in frontend by many field's kind, but... there is someone here that could put me in the right direction? I would be able to arrange product in frontend by a custom field previously defined (eg Man/Women attribute without use categories)

[Loris]

no suggestions?
a trick could be used as in http://forum.virtuemart.net/index.php?topic=90833.msg330052#msg330052 similar to corymp hack using a product field for the scope and not a custom field...

other ideas boys?