Nighttime underwear for Toddlers

I have a nephew who is 3. He is potty trained however when he spends the night we don’t want to risk accidents since we don’t have a lot of backup clothes for him etc so we put him in pull-ups. He hates them but tolerates it. We don’t like it either but obviously my mom, sister and I are not experienced in the kiddo world anymore 😂 Is there like underwear that is maybe washable, reusable, or something that doesn’t feel like a diaper? What’s the best brand? Most comfortable? Absorbent? We are adults and know nothing.

*when he’s at home he doesn’t wear diapers at night however he’s with us we don’t want accidents you know