I've written in the past how Zara led the world by applying just-in-time manufacturing and data analytics to bring us fashion forward product design. This has given them an advantage over traditional retailers by circumventing the traditional seasonal approach to fashion.

Instead of waiting for the leading designers to reveal on the Paris catwalks what we'll be wearing next year, Zara's innovation was to take the Dell Computer model. Zara replenishes stock in their stores every week, see what sells, then make more of what is popular. Rather than sitting on large quantities of stock hoping people will like what style you've backed, Zara take a test and learn approach. They never back one colour or style for a full season, Zara simply adjusts what they manufacture on the fly to what the consumer wants this week.

Fashion challenger brands risk destroying the advantage they have created

Retailers are losing the power to maintain margins by encouraging a buy on sale mentality. According to Robin Givhan, the only clothes critic to win a Pulitzer Prize, with the constant turnover and turnout of items due to the ever-quickening fashion cycle, there’s no need to buy anything at full price anymore.

While bloggers and fashion critics have used social media to drive awareness and demand of the weekly fashion cycle, retailers she says are to blame for the loss of their pricing power.

"Retailers talk a lot about how the availability of show images pique the interest of consumers before the clothes are available. But I blame retailers for creating a system in which they want spring clothes in November and more shipments every five second[s] and then putting things on sale when they've only been on the racks for one second," said Givhan.

Consumers usually don't know how to establish the value of something, it's actually within the power of the seller to frame the price that they will believe is fair.

Innovate for pricing advantage

If you have innovated your way to a price advantage, don't throw away your smartly won margin. Instead, decide how you can frame the price as fair value, for instance in terms of more for the same, or faster for the same, or better for the same. Offering something for less is an approach fashion retailers are finding comes at the cost of not just profit, but long term survival.

Don't drive your category to the bottom the way Persian Rug stores have, where in every corner of the world the SALE sign on the window now means OPEN. Here's one I snapped in Hong Kong...