buying down jacket of stock and second hand

We are importer and exporter all kinds of goods,especially DOWN JACKET in Vietnam.
In this time, we have order from one of our customer about "STOCK OR SECOND HAND(not new one) OF DOWN JACKET".

Our inquiry as belows :
1.Item : Stock or Second hand of Duck down jacket
2.Inside Filler : at least "50% Down and 50% feather"
3.Outside Fabric : Any grade.
4.Q'ty : min.10,000PCS
5.Payment : Irrevocable at sight L/C