The cover image for their August highlights on the social media platform shows both Prince William and Kate wearing Team GB polo shirts, with the Prince in the grey style and Kate in navy.
When they released their video message though, Kate was wearing a Breton-striped top by Ralph Lauren instead of the Team GB polo shirt.
William caused a stir when the clip was released in August as he sported a beard for the first time since 2008 and since then, he appears to have grown out his facial hair.
The royals appeared alongside a number of stars including David Beckham and Snoop Dogg to congratulate Team GB on their triumphs at the Games.
US rapper Snoop Dogg started the video by saying "greetings loved ones" and ended it with the words, "Thank you Great Britain, on behalf of big Snoop Dogg, the Prince and his lovely wife".
Kate said: "From all of us watching at home, congratulations to Team GB."
William then added: "Well done on all you've achieved, you've been an inspiration to us all."
The Prince did not travel to Paris for the Olympics or Paralympics this year, with William sharing the important reason as to why as he met with swimmers Adam Peaty, Tom Dean, Maisie Summer-Newton and Louise Fiddes during a visit to Birtley Community Pool in Tyne and Wear.
The Prince was asked by Tom: "Did you manage to get out [to Paris]?"
William replied: "No I was so keen to come but I have to say after reading someone's interview about Covid [looking at Adam Peaty - who tested positive during the games] I decided, because my wife was obviously having chemo, that I didn't want to risk bringing Covid home, so Adam very kindly reminded me that that was still a thing! But we watched the whole thing. We were glued to it every day."
Kate is making a gradual return to her public duties after sharing on 9 September that she has completed chemotherapy .
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I am so thankful to hear that Catherine princess of Wales has been able to stop chemotherapy and is reported to be cancer free. Congratulations princess Kate! All of you are doing such a wonderful job with your work. I only have one negative thing to say and that is Prince William I do not like your beard. It makes your face look dirty and 20 years older. Please shave that thing off your face and let us see that beautiful smile of yours.
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