I feel like the traditional singlet is the best uniform for the sport. It works perfectly fine. It's not an issue.
And I feel like our failure to get some kids to wrestle is not really about the uniform, it's way more about other factors (it's a hard sport, kids are "specializing" more and more nowadays, there are more opportunities for kids to do winter off-season for other sports such as winter baseball or lifting for football, etc.).
Recruitment & retention are two very difficult aspects of coaching and it's a never-ending process. But it's a challenge we have to accept to keep our sport going and growing.