When I made my comment to the "ladies" I was referring to the other two posters in the same profession as me btw, not a derogatory statement to the customers so I apologise for that.
I was using Walmart as an example, the factories I use are actually competing with Tommy Hilfiger, Ralph Lauren and Guess production. I have seen some Debenhams clothes on the storage rails there too, on my last visit. It's just the well repeated fact that 1 in every 4 containers on the sea at anyone moment us for Walmart (which as most of you know, includes Asda).
I know Debenhams invested in a weather predicting system, but that really isn't going to tell you when Spring is going to start in 2014 is it? It can be helpful in prioritizing your allocations and intake into the DC but as someone else mentioned the stock is on the water and if you've hopefully had a good season you will have sold out of previous seasons stock.
I have had my team delay and delay on sending out SS product, I have held back on my coats in store, my sweat stock mix is around 190% higher quantities than ly, with a lower ASP and better size runs, yet I am only selling around 80 more units a week than LY when it was 10 degrees warmer across Europe. I have put all of my winter accessories into a basket on 3 for 2 and sold about 10% more over plan. So I lost more money than if I hadn't bothered. My sales are suffering because I made the decision to try and extend Winter in line with the weather, and god am I hearing about it!
For the customers on here who want a long sleeved tee shirt, on the chance it may be cold, I would have to stock at least 2 of each of your size range in my stores so on average I have to buy let's say 24 units just to sell you one. And more than likely in a few colours. Not only that, I may have 150 shops so I would be expected to stock 24 in each of these are I don't know where you are. So I have to stock 3600 units at a likely cost of around 8000-9000 pounds to sell one t shirt at £12.99. If the weather changes next week, and you change your mind, I am left with 3599 long sleeve tee shirts.
We have to put our money where the least risk is, and that is in definite seasons. This is why I mentioned that transition is the riskiest season to predict, and you tend to put less of your money there. The spend has reduced based on historic customer patterns. I go back and look at 4-5 years history and calendar patterns to see which seasons and product have the best mix. If the customers aren't buying in an historic pattern, we have to move the money.
We have a limited budget to spend and targets on the stock we have to close the season on, so we have to put our money where the least risk is.
I'm not saying whether it's wrong or right, I think people in the industry have come on and tried their best to explain how the business works. I am a customer and a mother too. I do oftern buy an age in advance but only in the end of season sale when I see a cheap snow suit at a knock down price for example.
I am constantly reminding my team of the view point of the customer, to my husbands frustration i used to spend all my free time competitive shopping and analyising customers in shopping centres,and yes when I did work in a retailer that made a lot of floral dresses I was the loudest voice for a capped sleeve. 
And who said we're not listening? Of course we are, but I can't turn around a customer requirement in a large retailer in a matter of days. It's because we listened to customer trends on transition that we have the situation we see now.