Buying in a local shop or online doesn't matter. They both have advantages and disadvantages if you compare both ways. You have to choose the one which is most convenient to you, because it is not possible till now to combine both ways. A big advantage of the internet is, that you are not limited to local stores and shops. They are plenty of different shops available and you buy womens winter down jackets from China. The designs are always different and you can surely find down jackets you like and fit your style.
Because there are thousands of different styles and colours you can limit your searching results, which you can't do in local stores. You can choose the style, colour, size and even price and then browse. In an internet shop you can not feel, touch and try them on yourself when browsing.
Same goes to cheap knee high boots for women. You wear these in your free time so let them fit to your style and shoes. They should be comfortable and fit to the season. In winter you need warmer down jackets than in summer of course. If it is a good shop they will give this information in the description as well.
You can sometimes choose colors and of course always the size. Some shops even provide an video where you can see all details of the down jackets. If there are some customer reviews, feel free to read them.
First: Go to the down jackets pages of Taobao website.
Second: Confirm which women down jackets you like and copy the links to the search box of Yoybuy.com.
Third: You can find all women down jackets from Yoybuy.com and order it at Yoybuy.com at a lower price.