Life with psychosis can be tough at times, but to steal the phrase from McMillan, it's still life 
I am currently recovering from PTSD myself, I wasn't aware agression was a symptom, it wasn't one of mine. When it was bad it was very debilitating, anxiety, pannic attacks, flashbacks, emotional numbing, memory loss and concentration. At it's worst I couldn't even work out how to make a cup of tea because I couldn't concentrate for long enough, I wonder if something like this could be a factor with choosing clothes? I would manage eventually, but a few times ended up with a mug of cold milk with a tea bag in! I even got stuck in the kitchen once because I couldn't work out how to get out the house. I knew I needed to put my coat on and my trainers and I couldn't work out what I needed to do first and what order to do things in to get out the house. I managed eventually but it took me ages to figure it out.
Elyn Saks was talking about schizophrenia/psychosis. One of the symptoms is difficulty ordering thoughts/thoughts jumping about. I believe it was this she felt made self care difficult. DH struggles with selfcare, but has always managed to end up dressed I don't thimk I've ever had to pick his clothes out for him to wear, though he likes me to buy them for him.
I've found a few quotes from Elyn Saks:
"My mother helped me find clothes which was one of my least favourite tasks; there were too many choices, I could never make up my mind, and whenever I tried to picture circumstances in which I would wear these new clothes, the thought alone made me anxious."
"Schizophrenia rolls in like a slow fog, becoming imperceptably thicker as time goes on. At first, the day is bright enough, the sky is clear, the sunlight warms your shoulders. But soon, you notice a haze beginning to gather around you, and the air feels not quite so warm. After a while, the sun is a dim lightbulb behind a heavy cloth. The horizon has vanished into grey mist, and you feel a thick dampness in your lungs as you stand, cold and wet, in the afternoon dark.
For me (and for many of us), the first evidence of that fog is a gradual deterioration of basic common-sense hygine - what the mental health community calls "self care skills" or "activities of daily living" Once away from my parents' watchful eyes, I grew inconsistent about asking myself the taken for granted questions. Or maybe I was muddled about what the right answers to those questions should be. Are showers really neccessary? How often do I need to change clothes? Or wash them? Have I eaten anything yet today? Do I really need to sleep every night? Do I have to brush my teeth every day?
Some days, the answers were clear as a bell: For heaven's sake, Elyn, clean yourself up! And so I did. But other days, the questions and answers were just too hard to sort out. I don't know, I dont know. Or, simply, I just couldn't remember: Did I do that already? Did I do that already? Did I do it yesterday? Takingcare of myself meant doing more than reading a book or finishing a term paper; it meant strategizing, organising, keeping track. And some days, there just wasn't enough room in my head to keep all that together."
I don't think its necessarily relevent to your husbands problems, though I found it interesting.
Has your husband ever seen a trauma specialist? I had something called IEMT ( similar to EMDR ) which was like someone had waved a magic wand, the flashbacks, pannic attacks and anxiety completely stopped after the second session (they were much better after the first) and gradually my thinking is recovering.