According to the search results, the size of a youth large varies depending on the brand and the specific measurements provided by the manufacturer. However, there are some general guidelines that can be used to determine the size of a youth large. Below are some examples of youth size charts from different brands:

• Peter Millar:
  • Large (11-12): 58-62", 85-95 lb.
• Tactics:
  • L (12-14): 31-33", 26-27.5"
• Youth Sizing Charts | Tactics:
  • L 12-14: 31-33", 26-27.5"
• 100% :
  • L: 10 - 12, 140 - 150 cm
• Standard U.S. Apparel Size Chart:
  • Youth LG: 14-16, Chest (inches): 32-34

As seen above, the size of a youth large can range from 10-12 to 14-16, with chest measurements ranging from 31-34 inches to 32-34 inches. It is important to consult the manufacturers sizing chart for the specific brand and product to ensure the best fit.