My mistake.
I thought you actually meant "custom field" but accidentally said "shopper field".
Showing or hiding "shopper field" has nothing to do with template, it is a virtuemart core thing. If you add a new "shopper field" and make it "published" and enabled "show in registration form", then that field should be appeared in the "registration form".
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Did you already do that?
But still that field doesn't show off in the registration form?
Regards,
Support