Russell Wilson is standing by his woman ... saying Ciara looked FLAWLESS while singing the national anthem at the Championship game last night ... despite criticism that she let too much hang out.
The drama began when ESPN's Bonnie Bernstein tweeted about the singer's low plunging dress -- saying, "Dear Ciara. You're stunning. But this is a National Championship Game. Kids are watching. Cover up.'
The tweet started a firestorm on social media -- with everyone from Hugh Douglas to La La Anthony supporting the singer ... and ultimately Wilson decided to throw in his two cents.