The thing about panties is they can come off at anytime.
If you wear them you get the added benefit of taking them off while on the date.
He might have to do the old double take, like he was sure he saw panties down there a minute ago.
You also get to see how attentive he is to the nether regions to notice that they be missing.
Even sling shot them into his face over the dining table.
You also get the chance to assess him and decide if he is worthy of your pantilessness or if he might be a prude, poindexter etc.