You can donate used items in "Beautiful Shop"
You can also buy clothes donated by others there.
If your donation is more than 3 boxes, they come home.
If you need boxs then you can buy some boxs in a post office or you can take free boxs from Big-mart(Home-plus, E-mart).
You can apply on the homepage.
Homepage: http://eng.beautifulstore.org/take-action
Close to home is as follows. You can donate in person.
Mangwon store
Location: Line 2, Mangwon Station, Exit 2, 20m (Myeongwon Market)
Phone: 02-3144-1014
Address: 69, World Cup-ro, Mapo-gu, Seoul
Office Hours: Monday-Saturday 10:30-18:00
Yeonsinnae store
Location: Line 6 Yeonsinnae Station Exit 2, 300m (Yeonsinnae Market)
Phone: 02-356-8004
Address: 253-9, Yeonseo-ro, Eunpyeong-gu, Seoul
Office Hours: Monday-Saturday 10:30-18:00