Apex domains cannot have CNAME records.
Question and response
Question
dig irreverentshirts.com. NS
Answer
irreverentshirts.com. 5 NS ns-116.awsdns-14.com.
irreverentshirts.com. 5 NS ns-942.awsdns-53.net.
irreverentshirts.com. 5 NS ns-437.awsdns-54.com.
irreverentshirts.com. 5 NS ns-1509.awsdns-60.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0