Hi, you can come to yiwu and buy all of them you mentioned in yiwu futian market in 3-phase.

Dear Sir:
There is one special city called Keqiao or also known as Jiaxing .
you can search just in this webside.
That is a very famous city for all kinds of fabrics . You can find silk thread,silk fabrics in that city . NOT in Yiwu.
beading accessaries are in Jewerly accessary part . 3th floor, C,D,E,F area.
embroidery accessaries are in second floor of 3th area of futian market.
Good luck !

i think she is asking silk thread so yiwu is better, if silk we can say keqiao,guangzhou and hangzhou......

Is it possible to order embroidery accessories to be posted to South Africa?

As I know, some such items are posted to foreigh countries. But to make sure the quality, you'd better ask a trustworthy friend of yours to choose some good ones and then turn to the sellers to post them out.