It tells you how to make a leech-hide jacket with the following components:
    3 - bunny pelts                             
    8 - tanned leech-hides                      
    2 - ice yeti pelts   

It tells you how to make a pair of leech-hide gauntlets with the following components:
    4 - bunny pelts                             
    4 - tanned leech-hides                      
    1 - ice yeti pelt     

It tells you how to make a pair of leech-hide trousers with the following components:
    2 - bunny pelts                             
   10 - tanned leech-hides                      
    3 - ice yeti pelts 

It tells you how to make a batch of five (5) tanned leech-hide with the following components:
   10 - rock leech hides                        
    1 - tanning fluid                           
    1 - peroxide                                
    1 - vial of cytidine



So, your 2x leech requires the following:

18	- bunny pelts
44 (45)	- tanned leech hides
12	- ice yeti pelts

45 tanned leech hides needs:
 90 - rock leech hides
 9  - tanning fluid                           
 9  - peroxide                                
 9  - vial of cytidine