When you say "boots" do you mean actual racing boots, or any kind of hard shoes (basically anything short of slippers, socks or bare feet)? I wear sold old shoes with a thin sole and Abruzzi short gloves (all my wheels are Suede/Alcantara), so I voted Gloves + Boots.
Got a rubber wheel (T300RS) so no gloves. I wear sneakers though, especially as I use a brake pedal mod (not the conical one, but squash ball under it instead) and for heel-toe the pedal face edge would hurt my foot.
Obviously no right or wrong answers to the survey. For me, I like wearing karting gloves and shoes. The keys for me was getting them to fit perfectly. They are extremely comfortable. The grip and feel on the wheel just feels right for me. Also, the stability on the pedals and force that can be applied to load cell feels much better that socks. Driving without the gloves or shoes does not feel right for me now.