I bought these shirts for my boys for their grandmothers wedding and also for our trip to Hawaii. My youngest who is 5 years old usually wears XS boys and my 8 year old who is under his age wears small to medium. l Depending on the business. I ordered xs for my 5 year old and small for my 8 year old. For comparison, I have attached old dark blue shirts in size to the product. Old Macy Shirts - XS and MED. Hawaiian shirts are a bit bigger but I think they would look great! I was very impressed with the quality of the fabric in the shirts. Note, however, that shirts don't have room to stretch because the material doesn't stretch.
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