Now I'm all for wearing whatever in the privacy of your own home, and by all means, if you feel confident enough to wear said clothing, by all means.
Personally, I lack that type of confidence. Oh, I'll wear an outfit that I feel perfectly fine in, and my mirror agrees.....until I see a picture and my jaw drops. Why the hell didn't someone tell me I looked like a heifer before I left the house? Or suggest another accessory/blouse/skirt/pants/entire wardrobe change? Oh yeah....I'm the only one in the house with any type of fashion sense.
I think the last time I wore a bikini was before child #1 was born. I didn't like my poufy tummy, so I covered it up with a good tank suit. And think I looked damn good back then. After child #2 arrived, I could no longer fit into that suit, so bought another. And was fine in that. But after #3 arrived, and money was tight, I had to buy a regular tank, and am more comfortable wearing shorts over my lower half, until I could afford a better one.
I'm appalled by women of a certain age and weight who try to look twenty years younger. I don't want to see my grandma in a string bikini, and frankly, neither would you.
So is this just me? If you have flabby arms, cover them up! If you can't wear a bra with a certain shirt, wear a cardigan over it. Layer, for god's sake!