Apex domains cannot have CNAME records.
Question and response
Question
dig dresstoweb.com. NS
Answer
dresstoweb.com. 5 NS ns1.dresstoweb.com.
dresstoweb.com. 5 NS ns2.dresstoweb.com.
Authority
The response has no authority records.
Additional
ns1.dresstoweb.com. 5 A 5.135.50.140
ns2.dresstoweb.com. 5 A 148.135.39.188
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0