I wouldn't bother tbh! It feels early to me so I'd wait until they're 2.5 or older and follow the Oh Crap! method (or a similar). You have them naked from the waist down at home for a few days so no underwear. We found that introducing underwear once they've almost got it to be quite tricky as it felt like a nappy. He ended up going commando in trousers for a week or two before we were confident enough with underwear.
^ my daughter is 18 months and we’ve been working on it for a month. She still has like one accident a day but some days none. It’s usually when we go out because she’s way too tiny to sit on a normal potty and doesn’t like using a portable potty in the car. It is so much easier than changing a bunch of diapers a day!
Hanes. They leak after a little bit but if you catch it fast they won’t. They are also too big for my daughter still so that makes them leak more 😫 my daughter is 22lbs 9 ounces and pretty slim so the 2Ts are still big