I'm in the minority. I never ever wear sleeveless!
I used to wear a bit of sleeveless many years ago, but these days I don’t wear sleeveless unless I’m practicing hot yoga or wearing a bathing costume. It’s not a modesty or visual thing, but a comfort preference. I find sleeveless tops and dresses overly breezy on a warm day and particularly uncomfortable in air conditioning. On a hot day, I don’t enjoy the sun beating down on my bare skin. I prefer to cover up in the heat and sun, just like they do in the hottest countries of the world. Instead of adding a topper to a sleeveless item to create comfort, I simply buy tops and dresses with sleeves. I don’t find wearing sleeves under jackets bothersome. I might make the sleeveless exception for a stunning formal gown because I do like the look of sleeveless dresses, but the weather would have to be perfect and absolutely no air conditioning.
I like short, lantern, elbow, flutter and three quarter sleeves in Summer. I wear long linen and cotton sleeves and scrunch them too. This is in 90F to 105F, btw. I spend a lot of time in Salt Lake City these days, where it is much hotter than Seattle.
My high Summer items.
