the first one that i could think of that i tried that fit me was a pampers size 7 from 2009 (back when pampers was still good before the stupid 360 fit in the pull ups and 3 channel padding in the tape based diapers
this was the first time i wore a real diaper since 2002 when i wore that store brand diaper in front of my dad
back then i could still fit in pampers size 7 (as i was 12 at the time) and i wet it but because it was a baby diaper, the padding didn't get squishy but instead slushy (by then i knew i was too old for baby diapers, and didn't really like pull ups that much)
so after that i was at food basics with my mom and i found a pull up/tape diaper hybrid (almost like those pampers convertibles but for adults) and i wet that as well (although i couldn't saturate all of it due to me not having an adult bladder yet)
same with an abena abri form i got from the food bank (which they rarely sell in canada these days)
it was the first diaper i used with a wetness indicator so i wondered what the yellow line did when i wet it (as i was used to the blue indicators on pull ups that smudged back then), but again because of my weak bladder i couldn't saturate the diaper enough to turn the abenas indicator blue
however the first diaper that i used properly and fit me (like a real diaper should) was a prevail diaper i stole from my local st vincent de paul (because my mom didn't want me buying diapers with her money) and i stared at the mirror wetting it and watched the yellow line turn blue
(which by then after going at it to alot of wetting videos and abdl art i knew the yellow indicator was supposed to turn blue)