Size 2X. 
 
                      Length     Chest circumference
XS(0-4lbs)       8                         12
S(5-10lbs)        9                          13
M(11-23lbs)     10                       14
L(24-45lbs)     11                         15
XL(46-70lbs) 15.5                    18.5
2X(71-85lbs)    17                       23
3X(86+lbs)       18                       28
 
20% of this sale will go to the Trevor Project, an organization that provides crisis intervention and suicide prevention services to lesbian, gay, bisexual, transgender, queer & questioning (LGBTQ) young people.