Take your shoes off and lay them near the bar.
Go to a hot girl, preferably not near your shoes.
Walk to her and compliment her, how nice her shoes are.
Don't forget to look a bit too obvious at her shoes.
She will most likely notice that you are only wearing socks.
Now there are 2 scenarios possible:
The why don't you wear shoes question?
Tell her you are making this a not cliche pick-up line.
And ask her if you can buy her a drink.
The where are your shoes question?
Tell her that your shoes are at the bar.
Ask her to come along and tell her you will buy her a drink.
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