Interesting thing about Stormtrooper helmets.
As a kid, I got the original Luke Skywalker in Stormtrooper disguise with the removeable helmet back when it was initially released (Yay!).
Unfortunately, my grandma cleaned my room while I was at school and thew away a bag I had containing all the weapons of every Star Wars figure I had at the time, including the helmet of the aforementioned Luke in Stormtrooper disguise (Nooooo!)
For several years, Luke had no helmet. I was able to gradually replace most of the weapons from new figures I got over time (unfortunately,I had to use colored toothpicks for lightsabers though, but I digress), but in the pre-eBay years, replacing Luke's helmet was essentially impossible for me.
As luck would have it, eventually Kenner (or was it Hasbro?) released a series of accessory kits for various figures, including one for Stormtroopers that featured spare helmets, blaster rifles, and holsters. Suffice it to say, I made sure my previously poor Stormtrooper Luke was finally stylin' in full gear.