I'll double check, but I'm pretty sure the Acts of Vengeance crossover where Wolvie fought the Mandarin was the first time we see Betsy in what was basically her underwear (she stripped down to it from her ninja armor), and all those issues were done by Jim Lee.
It always kind of annoyed me that she continued to wear her "underarmor" even after returning to America. It was clearly just cause they liked her in it. But it bothered me like Lionel's suit in Thundercats always bothered me (he is essentially wearing children's clothing that he grew into)