I am a great supporter of riding in what ever works for you. For me riding my recumbents it is a regular T-shirt that most of them I get doing club rides. I wear rugby shorts I buy for $15. Of course since I ride bents I dont have to buy high price cycling gear to protect me from my bike or trike.
However the one place I do bow to cycling convention is cycling shoes. They have provision for clipless pedals, and have the stiff soles. I use clips for the trike since IMO you need them for safety on a tadpole trike. On the bent bike I use a different pair of bike shoes but use platform pedals.