You cant expect guys who were awakened at dawn by the FBI to put on nice cloths. When they go out im sure they dress well. The day to day dress code is emblematic of society in general and the casual dress code we see today at large companies. This isn't the 70's and 80's where people needed to wear suits to work or restaurants.
Again, a crip or a blood dress like 12 year olds and thats reflective of their culture and IQ in my opinion. Plus, you can understand a fucking word they say when they talk. Thats another discussion though.