Obviously, he is going about this the wrong way, if he wants to see you dressed nicely he needs to make an effort and ask you to go out to a pub garden or for a walk, or to a restaurant when they reopen, or he can plan a date night at home.
Since Covid and WFH I've started wearing quite ugly baggy joggers the whole time I'm at home (workday, evenings, weekends). I tried to buy nicer ones but stupidly kept some that I now find are too tight around my middle. I've ordered others that also look terrible.
I know that both my DH and I think I look dreadful in them, but he would never tell me not to wear them, he knows I'm comfortable. I know that he'd love to see me more dressed up, in the past he's commented on how hot I look dressed for work (in a yearning way that indicated 'why doesn't she dress like that for me'). He always compliments me when I do actually get dressed properly.
We've been together 21 years, obviously, I don't need to impress him, but sometimes for both myself (sick of the sight of me in slobby joggers) and him, I make an effort, e.g. at a weekend I'll wear jeans and do my best to stay in them all the way through and after dinner - then by 8 or 9pm I give in and on go the joggers! Or some working days I get inspired and put on my jeans for when he comes home (for about an hour).
I do feel a bit like I've 'let myself go' wearing my ugly baggy joggers the whole time. I wish I could find real clothes that are super comfortable but also look good.