https://github.com/grassmunk/Chicago95 and https://github.com/B00merang-Project/Windows-95 get quite close if you use them together. The B00merang one has presets for the GNOME/Cinnamon/MATE desktop and a GTK+4 theme (which adds terrible padding compared to the usual GTK+3 one, but at least it has visible and properly 3d-shaded widgets).