nice ! 
i like the pattern he used/created its different from conventional bracer ...   
did he molded em ? 
i think it would be more ''realistic'' w/o the glossy finish ... compared to other stuff that people wear in ren fest or medieval events,  it could looks like  some kind of toy... plastic-like  
nice job on the buckle job, the straps are straight but maybe too narrow... could have made em  wider to fill the  buckle space ...  
keep up your good work ( to your  son  ) i hope he had a good time at his event