Holy grail of white long sleeve tight T-shirts or base layers

[SpotTheGreatPony]

Can anyone recommend?

must be fitted
have stretch
have properly long sleeves

thanks

I love the Uniqlo cashmere heat tech one in natural it’s semi sheer and looks great on .

I love the Uniqlo cashmere ones too - but it’s a long way off being a true white. I used to swear by the primark ones - perfect amount of stretch, but now they’ve reduced the stretch and they’re just not as good. M and s do a second skin range - I am waiting for the round neck to come back into stock in white.
I have a white a polo neck from kettlewell - but really for the money I wouldn’t buy again.

very hard to find true white base layers!

I bought the Reiss Tessa. It's ruched at the sides which you might not want. It's also slightly ribbed.

https://www.reiss.com/style/su742387/w51523

I have the M&S thin long sleeve, it’s good but is no longer white, I also have similar from Next but not as stretchy, I have really lovely, soft one from pour moi but it is grey not white…as you can tell I am also on the hunt!!

I got mine at White Company. Long sleeves and stretchy.