Pastels always surge in popularity this time of year and I might have just been convinced to give lemon yellow a try.

But is Zara starting to lose its shine after posting slower sales growth at the start of this year? Mainstream rivals are trying to catch up and newer, online brands are disrupting the market.

Zara is owned by Inditex, the world's biggest fashion retailer, which runs a string of store chains including Massimo Dutti ...