surely if it’s cold enough for a jacket, it’s cold enough for sleeves.
And how many times do you find yourself pushing the sleeves up? Which then stretches the cuffs so they go baggy. There are many occasions when there’s a cool breeze/wind, but not so cold that your arms feel cold, and a gilet is perfect. I’ve got several, a NF Nuptse down one I wear in colder weather over a light jacket, a Uniqlo ultralight down gilet I often wear over a tee shirt, and I’ve got a couple of fleece ones, one I bought at the ‘94 Worlds in Vail, which is a tad tight now, and a Fox Racing one I bought in Chamonix in ‘95, in grey and yellow, it’s only flaw was not having hand-warmer pockets, only a rear pocket for putting stuff in when on a bike, but a couple of years ago I got to know a seamstress who put pockets in. Even before that, it was one of my most worn items of clothing, I’m wearing it now, and if the weather is cool, but not central heating cold, it’s nearly always what I’ll wear over a tee shirt.
I do also have an old Unabomber hoodie, which suffered the baggy sleeve syndrome because I was always pushing the sleeves off, so I just hacked them off with scissors and I often wear that as an alternative to the Fox fleece gilet.
It’s a really simple, practical item of clothing that takes up very little space, keeps my core at a comfy temperature while allowing my arms to be free of