Denim comes in all shapes and sizes; from skinny to slim fit to bootcut. We wear it while gardening, to work or to an evening soirée. But in 2014, denim sales in the US dropped by 8%, as activewear grew by the same amount. How can denim brands stay relevant in the age of the yoga pant?

Americans buy five times as many clothes as they did in 1980, with 10.5 million tons shipped off to landfills annually. While brands like Patagonia are making coats that last a lifetime, Twice is helping people monetise decluttering. But can second-hand shopping match the buzz of fast fashion?

We no longer crave the new. Half of online shoppers in the UK visit eBay each month and the site's fashion category attracts 4.5 million people. Luxury goods re-seller Vestiaire Collective has discovered that British women are leading the way for buying and selling pre-loved clothes online.

The used goods market in India is expected to grow to $18.4 billion in 2015. Who’s driving it? Savvy young married couples in urban areas – they’re buying anything from books to cars online. But it’s also this group that are selling. How is a desire to de-clutter fuelling India’s second-hand market?