VATPAVEMens Summer Tropical Shirts Short Sleeve Button Down Aloha Hawaiian Shirts

Are the measurements in inches? M chest is generally 38-40 but this states 44.9. Are they that much bigger? I assume they shrink after wash too.

What measurement is pit to pit on a 2xl please?

Does the shirt shown in the next link have one button at the neck level? https://www.amazon.co.uk/vatpave-summer-tropical-shirts-hawaiian/dp/b089s325

what size for broad, 50" chest?