According to this Guardian report, Manning was often kept naked while in solitary confinement at the military base of Fort Quantico, and had to be drugged heavily with antidepressants to bear the conditions. At night he was placed in a suicide prevention bed, blanket and smock, which his lawyers have requested to produce as part of their evidence in court.
Suicide prevention beds feature full locking systems that restrain the arms, legs and body and the smocks and blankets are akin to straitjackets.
Though the US Army argued the confinement was essential for Private Manning’s own safety, on Prevention of Injury grounds, experts said they repeatedly disagreed with this mental health assessment, saying that he had not self-harmed or attempted to harm anybody else and did not appear to be at risk of suicide.
More:
http://www.theregister.co.uk/2012/07/30/bradley_manning/