お姉ねえさんパンツ

noun

big girl panties; girls' underwear (post-diaper)

Child-rearing term for girls' underwear worn after toilet training; often used in the context of transitioning from diapers. Compare トレーニングパンツ (training pants).

See also: トレーニングパンツ

• 娘むすめがお姉ねえさんパンツを履はきたがるようになった。

  My daughter has started wanting to wear big girl panties.

• トイレトレーニングが進すすんだら、お姉ねえさんパンツに切きり替かえましょう。

  Once toilet training progresses, let's switch to big girl panties.