Girls, When is it okay to ask a girl about her underwear?

Matthewmayhem
Myself, I don't think there is anything wrong with talking about underwear, but I know that a lot of the girls would feel awkward or whatever if asked, so I'd like to know what you think.
When is it okay to ask a girl either the colour of her underwear or which type of underwear she preffers?
I have found a good number of girls who were happy to talk about their underwear but there have been a good number who haven't liked it. I'd like to try my best in the future to not offend.
I'd like to know how you feel too. if you share that information with everyone, keep it a close guarded secret or whatever else in-between. thanks.
Girls, When is it okay to ask a girl about her underwear?
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