for all my comfort around queer, trans and other gender outsiders myself with many friends made as I fight politically; I find it hard to join in or experiment personally; just have to start somewhere. This is what safe spaces are for; thanks for the input.
If you just joke around with the cashier, they'll drop the subject.
For example, slanador's point number 3 but sarcastically, or 'do you think it matches my nail polish'/something else you aren't wearing.
You could also load up on a whole bunch of suspicious looking items, like condoms, honey, rope, etc. and show up at the cashier and tell them it's
really not what it looks like. Then they'll also have a story to tell.