I’m not entirely sure if this is the kind of thing you are talking about but I find something about sweaters / cardigans / sweater vests seem to lend themselves to a more cute look. To an extent I think so do things that might be considered nerdy like button up shirts / glasses / suspenders. Also colors that are usually considered more feminine but styled in a masculine way like pinks and purples.

Some sweater examples tv/celeb/animation:

Spencer (Criminal Minds) cardigan pbs.twimg.com/media/EyBVIIJW8AA3nz8.jpg

David (Schitt’s Creek) fuzzy sweater www.goldderby.com/wp-content/…/danlevy.jpg

Clark (My Adventures with Superman) sweater nypost.com/…/NYPICHPDPICT000013326225.jpg?w=1024

Sylvester (Scorpion) sweater vest static.wikia.nocookie.net/scorpion2011/…/latest?c…

Daniel Radcliffe in sweater iwmbuzz.com/…/aww-dorable-cutest-photos-of-daniel…