I bought DD some clothes in the 20% off event yesterday. But have got home and now wondering if I should have got the next size up. She’s away at grandparents so can’t get her to try on till tomorrow. The event ends today. If I take back to exchange for a bigger size later in the week, will I have to pay the difference for the extra 20% or will they just exchange at the same price? I think it’s option 1 but optimistically hoping it’s option 2!