Question:
Can I work on a piece of embroidery in the Nine Days? The article I am working on will be used either as a parochet for our shul or a wall hanging in our new kollel building. It will not be completed within the Nine Days.
Answer:
Embroidering is not permitted during the nine days. However in your case where the embroidery is being done to beautify a shul or a bais midrash.it is permitted, since it is considered being done for a mitzvah.
Sources:
O:CH 551-2. Poskim.