is there anything attractive about a gamer?

[Exian]

It depends on way too much to say for sure if dressing a certain way is bad or unattractive. For one thing, "putting on a shirt" is different than wearing it. Initially, when I think of a gaming shirt, I think of something kind of slobby, but with very little effort I can imagine an ensemble that would be very appropriate, even attractive, in certain settings.

What you wear definitely says something about you, but how you wear something speaks a little louder.

The OP paints this picture:
Gaming shirt
Walmart jeans
Whatever shoes
Socks that pass the smell test

This doesn't work anywhere, except maybe a lazy Sunday, or painting a house.

Instead:
A dark crisp gaming shirt (or any belogo'd shirt)
A pair of grey selvedge denim, or chinos
A cloth belt with a snazzy yet down played buckle
A clean pair of white sneakers (or chucks if you want to take the obvious route)
Now you have the option of taking it a little further:
Throw a jacket or a blazer over the shirt
Throw on a watch that matches the other metal you have on
Throw on some rope bracelets
Maybe a cap and some shades

Suddenly this gamer guy looks pretty well put together. It's not hard to imagine him in a setting where he fits in.

I wouldn't wear something like this, being 30yo and adhering to the "dress your age" rule, but if I had to, I wouldn't be mad at this look, nor would I feel unattractive, but that's just opinion.