For the African exports, sure - "mitumba" is the African word for "donated" clothing. If you speak German, public TV station ARD has a documentation: https://www.youtube.com/watch?v=djXkFedpTrE (and newspaper Zeit has a short text, based on that documentation: http://web.archive.org/web/20120822083146/www.zeit.de/2011/4...)

For homeless/refugees: at least this is what the Munich organizations regularly state within their calls (and especially during fall of 2015, where people brought in way too much stuff for the refugees and there were severe shortages of space and sorting manpower). Besides, asking someone if he can use donations before getting on the road is always better ;)