Besides doing damage at the Balenciaga shop at Galeries Lafayette I also stopped at the Acne Boutique in Paris. It's location is actually a bit hard to find, but it's next to the Stella McCartney store.
I bought the Acne 'Lina' sweater in bright blue with some purple undertones. It's made of wool and very warm, so not appropriate for other times than in winter.
The next purchase is kind of obvious if you visit an Acne store - the 'Pistol' boots. I wanted to get the ones with contrasting brown soles, but they didn't have them in stock, so I bought the all-black version.