Star Wars accessories are very small and many have been lost over the years. There are lots of different items items that went with the original figures. There were also accessories included in vehicles and play sets that could also be placed with figures. This basic guide should help you identify what these parts go with. Due to different worldwide companies making millions of these items there are alot of variants of each part. 

Star Wars accessories have become a bit of minefield these days with lots of reproduction items being sold everywhere. Be aware of how to spot reproductions as original Star Wars weapons can be expensive.