Just created a brand new character, went to the tailor, created a new uniform slot and under the uniform tab was the options for off duty and formal wear. If you're using a new character, make sure you're not using the default slot (as that didn't work for me).
Also at this point if you're not seeing that pulldown we need a screen shot to actually see what you're seeing as a drop down menu not existing doesn't make sense when if you can't use it it should be greyed out.
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