Liz -- they're hard for me to shop for too! Long ago, I was gifted a pre-loved "batch" of five long-sleeve tees that fit perfectly (I think they were Gap?). That was years ago, and I wore all of them right into the ground. It was so nice to just have them and not have to think about shopping for them!
Liesbeth -- that makes sense to me. If I had blouses or soft shirts, I bet I'd reach for those under cardigans. Most of the time, a button-front shirt feels too bulky to me under sweaters. I do it every now and then with an oxford or chambray shirt, but it's not my favorite.
FashIntern -- I feel the same way about low-contrast stripes. Goes with just about anything, looks better than a solid top if you decide to wear it on its own.
Jenni NZ -- I've been trying to make do with just baselayer-type tops to wear under sweaters, but I love chunky cardigans so much that I find myself needing tops that are easy to layer and still look good when a large swath is visible under an open or v-necked topper.
Sal -- scarfs over thinner tops, that's a good trick!
Phoebe -- I know just what you mean. I always feel done with breton tops once summer's over, and then get excited about them again as winter's ending. I'll have to look at Three Dots; I've heard them recommended before.
Rachylou -- glad to know I'm not alone!
Nemosmom -- it's incredibly hard to find just the right one! And the available options seem so limited compared to short sleeves, it's frustrating.
Catnip -- that's a good tip. I generally like LL Bean, and almost bought a long-sleeve henley from them this year, but it sold out in the colour I wanted.
Style Fan -- I agree that long sleeves are useful year-round, between the sun, the bugs, and chilly evenings.
Joy -- yes, patience for sure! It seems the good long sleeves only at retail appear well into the fall, and sell out fast.
Thanks all, good suggestions!