Read the rules before proceeding!

they're not panties

パンツじゃないから恥ずかしくないもん! パンツじゃないから恥ずかしくないもん!

"They're not panties, so it's not embarrassing!"

A "booster" line in Strike Witches wherein the speaker tells the listeners to forget that their underwear is exposed or treat their underwear as if they are wearing something over them, probably to put their focus on their job instead.