We sell down-filled jackets in the same time as we sell chiffon blouses or linen mini skirts. It may be January, but if you live in Miami or Minneapolis it will require different gear. The southern hemisphere is in the opposite time of the year.
You should be able to buy what you need for when or where you will be needing it.
This article romantically and logically covers many more examples of the difficulty we have finding clothes we need when we need them.