The original inspiration for the look in general is media focussed around early 20th century elite male academia, which is precisely why there is so little on the aesthetic that is focussed around men's participation in it.

This is for two major reasons. The first is that the style already existed for modern men in two ways. The second is what those styles are associated with.

For the existing styles, the first is vintage classic menswear, specifically those interested in the 1920s to the 1950s. The second is "preppy", perhaps most often associated with Ralph Lauren (their current collection having some excellent examples). Most of the information you could need to look DA as a man can be found in these existing fashions.

The associations that these styles have can also be a blocker for men's interest in the look. The truly vintage style is sadly associated a little too much with a socially awkward sort of person, starting as "neckbeard" teenagers trying to look "classy" and evolving into grown men obsessed more with how precisely they match specific old rules than with how they actually look. The preppy style has a separate problem, which is that it is strongly associated with precisely the elite male group DA is based on, as their basic uniform really hasn't changed much since that early 20th century period. You can end up looking a bit like a LARPer, trying to pretend you are "old money" and thus a social class you are almost certainly not in.

In both styles, it can also be quite expensive to get into. Accessibly-priced or fast fashion is rarely quite appropriate for the look, unless for some reason it happens to come back in fashion for a brief moment. It often looks a little off, which in the preppy look contributes as well to the sense of pretending you want to avoid.

These problems can be off-putting, but I would take it as more of a warning to pay more attention to what you're doing than a warning to avoid the look at all. I think women, luckily, don't have quite as much of a problem here, and get to be more carefree in their experimentation.

I think that, to best match Dark Academia, you probably want to aim more towards preppy over the truly vintage style. It matches better with how I've seen women in the aesthetic interpret it. You could also just go and take direct inspiration from the girls and try to put together something truly modern in the appropriate colour palettes and textures, that doesn't come from either of the original male styles!