Ada is wearing a Stella McCartney cropped turtleneck sweater, available at farfetch through three different stores :
STELLA MCCARTNEY Cropped sweater
STELLA MCCARTNEY Cropped sweater
You can find the same jumper in black too :
STELLA MCCARTNEY Cropped boxy sweater
She is also wearing lovely ankle boots, by Stella McCartney too, from a previous season.
You can shop at The Outnet the mocassins from the same collection, in taupe and in black :
Faux patent-leather moccasins