After coming back from Milan, Italy, I transferred at Munich airport in Germany and wanted to go to the duty-free shop to buy cosmetics.
Dior Chanel Lancome Guerlain and so on, these brands can be bought in the duty-free zone, and their prices are quite advantageous compared with domestic counters.
Some can also be bought on the plane. Perfume and cosmetics can be checked. If you take it with you, the perfume airport will let you open it. I don't know about other cosmetics networks, so just check it in.