Detectives believe a highly organised criminal gang was behind the theft and could be from the Wakefield area.
More than 5,500 TOG24 jackets were stolen from a trailer at A David Transport Ltd, on Fallbank Industrial Estate in Dodworth, South Yorkshire.
The gang used around 280 boxes to carry the anoraks to their getaway vehicle which was parked in a near by field.
Det Con Steve Mason, of South Yorkshire Police, said: “The offenders will have taken a long time to load up the vast quantity of jackets, which were men’s, women’s and children’s in different styles and sizes.
“We believe the thieves are part of an organised criminal group and that this was a targeted attack.
“They are likely to have distributed the stolen items over the Christmas period, passed them to handlers or sold them to members of the public in South and West Yorkshire.”
The theft happened sometime between noon on Saturday, December 7, and 4am on Monday, December 9.
The men’s jackets were black and petrol marl coloured, while the women’s were petrol and aqua marl.
The children’s garments were raspberry, indica, black and new blue.
They contained unique order numbers, printed on the label, that were specific to the consignment. The number for the adult jackets is 132090 and for the children’s it is 132093.
DC Mason added: “We’re appealing for any information regarding the possible sale of these jackets or the location of the stolen items.
“We also want to alert people in case they are offered any of these garments.”
Anyone with information should contact South Yorkshire Police on 101 and quote incident number 136 of 9 December, 2013, or call Crimestoppers anonymously on: 0800 555111.