Just in another pocket:

With a relieved sigh, you grabbed your wallet from another, deeper pocket on the side of your pants and paid Miss Pauline. She had a disappointed look on her face as she realized you had money to pay and, after you said your goodbyes and turned around to leave, she took a glimpse at your rear and bit her lower lip, saying to herself: "If you didn't have any money, we definitely could have worked something out..."

Deciding to take a bus to get home, since you didn't want to experience almost being robbed again, you arrived quickly at your house and opened the front door. Quietly, you left your new clothes in your room, since you didn't want any of your sisters to find out you were buying new clothes since they would probably try to make fun of you for it, Alice would try to wear them and just rib then apart after flexing her muscles and Ellen would just use them as cum rags and left them on your wardrobe, just for you to find out once you put them on.

But, now you remembered that Alice and mom were really good at catching girls (for some reason). Maybe they would be able to give you some advice on how to talk to Kathy and ask her out, even though, again, the girls they would usually bring home weren't any similar to Kathy (they were real sluts).

Also, how would they even react to you telling them this? Since Kathy grew up with you, they both knew her very well and your mom almost considered her as her daughter, how would she react if you told her you were going on a "date" with Kathy? You could also ask someone else for advice, like Sheyla, who is a great friend of Kathy, or Lenna, your oldest sister, who is away at college...