Can i use leather heirloom on my mail wearer

You're referring to the Leather Heirloom set from the Blacksmithing profession!

Yes, you can use the Leather Heirloom set on your mail wearer, but keep in mind that it's designed for leather-wearing classes (e.g., Druids, Hunters, Rogues) and may not provide the same level of protection as a mail set.

Here are a few things to consider:

1. Stat distribution: The Leather Heirloom set is designed to provide a balance of strength, agility, and stamina. Mail-wearing classes, on the other hand, often prioritize strength and stamina. The set's stat distribution might not be ideal for a mail wearer.
2. Protection: Mail armor provides more protection than leather armor, so you might not get the same level of survivability as you would with a mail set.
3. Appearance: If you're looking for a specific appearance or aesthetic, the Leather Heirloom set might not fit the bill.

That being said, if you still want to use the Leather Heirloom set on your mail wearer, you can do so. Just be aware of the potential drawbacks mentioned above.

If you're looking for a mail set, you might consider crafting or acquiring a set specifically designed for mail-wearing classes. These sets will typically have a different stat distribution and design to better suit the needs of mail-wearing classes.