I freely acknowledge that I know virtually nothing about the Tunisian suite. If the suite was a Tunisian gift, it is possible that it may have included a jewelled belt, which I feel it is highly unlikely Queen Fabiola would have worn, which would explain why we have not seen images of such an item.
Thanks for the suggestion Hans. It gave me something to think through.
Only by exploring various ideas, even if they run counter to published works or popular opinion, can we advance our knowledge.