Turkish President Recep Tayyip Erdogan on Saturday said the suspects being tried on suspicion of involvement in last year's failed coup should wear uniform clothing like the notorious orange jumpsuits used at US military prison at Guantanamo Bay.

"I spoke to the prime minister and.... when they appear in court, let's make them appear in uniform suits like in Guantanamo," Erdogan told a rally, after a controversy where one suspect was seen going into court with the word "hero" on a T-shirt.