Hi, sorry to hear you are both going through this.
My first thought (I am really sorry) is that my dad, who is in his 90s living with severe dementia, has some of the same struggles. For example, trying to get dressed, he would put clothes on back to front, inside out etc. Maybe two jumpers, something like that.
However, these issues arose quite late in his dementia journey - short term memory was the first thing to go. Has your husband any memory issues?
I accept that your husband won't want to go to the doctor - my father refused for many many years - basically as long as he had meaningful autonomy. Which meant he had no medication or support outside the family - it makes it very difficult for those who care.
Please talk to your husband about the fact he continues to drive, too, if you can. I recognise he has autonomy and you can't actually stop him. My dad continued to drive beyond when it was safe for him to do so, in my opinion, and I remember having to change gear for him on his last cat journey (I don't even drive - luckily knew enough to help). We sold his car after that.
I really hope it's not dementia OP, and I may well be wrong, but I thought it worth mentioning, just in case you are able to persuade him to get it checked out.