Depending on the commune, CPAS/OCMW promotes “Big Bang,” which is a shop where you can buy cheap clothes, toys and second-hand books, but also train for sales and trade. Big Bang is open to all, offering clothes, toys and second-hand books recovered from private individuals and refurbished if necessary. Persons assisted by the CPAS benefit from a 20% discount on the price indicated. At the same time, this project allows individuals who are helped by the CPAS to acquire vocational training and experience in the sales sector as part of a socio-professional integration project.” http://www.cpasbru.irisnet.be/fr/index.asp?ID=26
“Conviviale” also offers services for newcomer refugees including assistance with housing, furniture, feeding, and clothing http://convivial.be/.
In the Brussels region, NASCI offers material support to pregnant women and mothers. After they assess your request for support, you may be eligible to receive free items such as baby clothes, maternity clothes, school supplies, etc. Find more information here http://www.nascivzw.be/index.html
The Social Protestant Center in Brussels offers discounted or free clothing in exchange for a modest clothing donation (http://www.csp-psc.be/content/boutiques).
There are also a lot of second-hand stores and brocantes/rommelmarkt (local markets where people you can sell and buy second hand items) organised in many places to buy cheap clothing, toys and other goods like furniture. La ligue des familles organises them on a regular basis:
https://www.gezinsbond.be/Ledenvoordelen/Paginas/Tweedehandsbeurzen.aspx
http://www.dekringwinkel.be/kw/home_1.aspx
http://www.oxfam-secondemain.be/spip.php?rubrique9&lang=fr
http://www.thinktwice-secondhand.be/
http://www.lesenfantsdedouard.com/