mango clothes start at a US small and a European XS
they run fairly true to size
actually its the opposite. the US XSmall = EU Small (because American people are generally bigger on average:okay
depending on which tag you read, the sizing varies.
if you're going by true misses sizing, they run close to TTS a tiny bit on the small side maybe. but compared to most chain brands they run small to very small (although the looser-styled tops tend to be very loose, even in the smallest sizes)
ex, I wear a 24/25 in premium denim, J Crew's 0 is huge on me, Mango's 2 is often (not always) too small.
the b&m stores will only carry sizes US XS-L in tops, and 2-14 in bottoms, but more sizes are available online.
personally, I'm not a fan of Mango. I can find way better quality at the same price. I bought very little from them even with my employee discount when I worked at the Bellevue, WA store, and its US franchise system is very badly managed.
also the website doesn't really list fabric content, so be aware that they use a lot of synthetic fibers.