Lots of things "trigger" me. I hope this isn't War and Peace; I've been called out on that before. Without further ado:
My main fetish is my main trigger: as well documented in my posting history, it's masks within a medical setting. And not on a doctor or nurse, but a patient. It could be surgical masks (my favorite is tie-on. I love bows. But I also love the black earloop masks that can be bought over Amazon), N95's (duckbill, double-banded cone, or any other, with or without exhalation valve), or half mask cartridge respirators (such as the North 5500 or 3M 6000 or 7500 series). Some of the COVID-19-era cloth masks look good, too, but not with designs and such on them. I like solids: black or the traditional surgical pastel colors.
The patient in question needs to be a female, generally 18-25. I lean toward "cute" over "sexy", but there are many exceptions. She could be tall, blonde (especially platinum) and bronzed or very petite, baby faced and red or black hair and fair skin and freckles. She is athletic, but feminine. Cheerleader, soccer player, gymnast, ballet dancer. I love a very fit set of abs (and am likewise turned off by any extra weight that isn't muscle); this is the most important part of the young woman's body. Hit or miss. No in between.
I like legs to be well-toned. I like breasts to not be too large (AA, A, B), but nipples to be fairly large.
Going back to clothing triggers, I like cheer uniforms (authentic, not porny), and bows over scrunchies. And either a matching or black mask.
I also like footed pajamas (not those footless kigurumis with cartoon animal features and a hood). I like it when ABDL sites sell the old school '80'sish ones that have white vinyl soles AND toecaps. And sometimes they can be customized with mittens, as well. As much as mittens were never a thing on older girls' "blanket sleepers" (old name for footed pajamas) back in the 80's, I just like them.
Finally, I do like school girl uniforms. But not the porny ones with short skirts and high heels. I like knee length skirts and opaque white or red tights (especially cable knit/"sweater tights"). I love polished black mary janes.