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 https://pbs.twimg.com/media/EyBVIIJW8AA3nz8.jpg

David (Schitt's Creek) fuzzy sweater https://www.goldderby.com/wp-content/uploads/2020/10/danlevy.jpg

Clark (My Adventures with Superman) sweater https://nypost.com/wp-content/uploads/sites/2/2023/06/NYPICHPDPICT000013326225.jpg?w=1024

Sylvester (Scorpion) sweater vest https://static.wikia.nocookie.net/scorpion2011/images/2/27/Sylvester.png/revision/latest?cb=20170506031456

Daniel Radcliffe in sweater https://www.iwmbuzz.com/wp-content/uploads/2022/03/aww-dorable-cutest-photos-of-daniel-radcliffe-that-we-can-never-forget-3.jpg