So... How classic do you want it?

[soronil]

An alternative to that, if you don't need/want to use 25% of your screen for something other than the everquest window, is to use /viewport to create a 4:3 (or approximately4:3, don't have to be exact) view in your window.

This is a quickly thrown together example on my laptop. 1800 x 1000 eq window, 1333 x 1000 viewport. The entire UI fits off to the side. You can also do /viewport 233 0 1333 1000 to have equal black bars on each side, but then you probably still have your main chat windows over the main game view.

On my actual gaming PC. I have a 3440 x 1440 screen. I do 2400x1400 windowed EQ resolution. then /viewport 0 0 2000 1400. Slightly wider than 4:3, and then I have ~60% of my screen EQ viewport, 10% UI, and then on the 30% outside the EQ window i usually have wiki or whatever website up top and netflix or whatever on the bottom.