FYI Size 16 AU is size 12 in the USA... which is the smaller end of women's size Large.
SashaJ I'm speaking here as a female person, but here's what I see.
You asked him if you've lost your sex appeal and he answered you...and you argued with him about it.
You asked him if you nag and he answered you...and you argued with him about it.
If I were in his shoes, the very next thought in my head would be "What's the point of answering and telling her the truth? She just argues with me about it." Is that the kind of relationship you want to encourage with your husband? Because he stuck his neck WAAAAAAAAAY out to tell you he thinks you've lost our sex appeal, and he's trying to tell you what it is that is missing FOR HIM...in his opinion, not yours.
I also have to admit, that if my Dear Hubby gained weight, wore Uggs around the house and "dressed for comfort" it would be about as appealing as Carl from Aqua Teen Hungerforce:
I think what concerns me the most is that your hubby has made a real attempt to communicate with you that there are a few major needs he has that you are not meeting, and whether you like it or not, one need men have is attractiveness. I don't suspect he wants you in your F*Me pumps every day so much as something that fits you well, looks a little feminine and pretty, do a little something with your hair to make it pretty, and possibly a little daily makeup. So rather than being all upset that he was honest with you, I'd suggest that you take his words to heart! There are women at his office or school who *DO* take the time to look a little bit nice every day, and it doesn't have to be amazing...just consistently looking pretty nice.
As an example, I'm not saying I'm perfect but I do something with my hair every day (and I have extremely long hair down to...I can sit on it!). I don't usually wear make up, but I do put on his favorite perfume (Patchouli). He likes long flowy skirts, so when I go to work I'll wear them with a sleeveless top in a fabric that is soft and feels good and that I can move in. In the winter, I do wear pants or jeans, but I have beaded tops to go with them, or vests so that I have that layered looks (tee, vest, sweater). Then underneath I'll wear a REALLY red lacy bra or let him peek and then wear "normal" clothes over the top all day. The only time I ever wear sweats is Sunday afternoon when we watch NFL football games together, and then I don my football jersey, sweats, sneakers and look all "sporty."
I understand it's hard to hear, but really he has done you a HUGE favor! He told you right out loud that this is an issue. So now you can choose if you'd rather continue being angry and harm your marriage, or if you'd rather set aside your anger and actually work on fixing something on your side of the marriage issues.