We have something like this locally that the attorneys/law enforcement/court personnel refer to as the "pickle suit" as it's green. It's a combination hospital gown/restraint garment for people who can't be trusted to wear the regular jail scrubs and be cuffed. Can't tell from the picture, but maybe that's the case?
Around her it's called a frog suit. It appears there is some type of ropety string on his right shoulder so it would definitely not be that kind of suit. IMO it looks like some crappy old raggedy shirt of his.
They look like this and have velcro and are thick so they can't be twisted and use as a noose.
http://i.dailymail.co.uk/i/pix/2012/10/02/article-2211996-1551516B000005DC-210_634x398.jpg