The Legal Reality:
Both Daredevil and its titular character are awful at law, and in a way that really makes the legal system look so much worse than it actually is. Let's start with something simple that proves Foggy Nelson and Murdock are just terrible attorneys (our link is to the site Law And The Multiverse, dedicated to examining issues like this). There's a long, dramatic sequence when the Punisher enters the courtroom in chains:
Huh, that really does seem like it'd bias the jury -- you've got him dressed like a convict even though he hasn't been convicted of anything. The guy might as well be in a skull shirt. It's crazy that they do it this way!
Which is precisely why in real life, they don't. The Supreme Court has ruled that the State isn't allowed to make a defendant wear that in court. A prisoner may choose to appear that way, if for some reason they want to bias the jury or just don't know what the hell they're doing. But preventing a defendant from appearing in the dehumanizing garb of a prisoner is so crucial that public defenders often hold clothing drives to make sure their clients can dress up. This is Defense Attorney 101 shit here, but both Nelson and Murdock appear to have missed that class.
Though it is tough to find suit jackets with a skull on them.