Any relatives with the initials H. H.?
I'm not an expert, but as far as it's possible to tell from a B&W photo, the colour of the shirt reminds me of some WW2 RAF photos I've seen. Or possibly RAAF?
I thought that is what they might be - never heard them called that - belt loops here.The little tabs that hold the belt in place. You thread the belt through them.

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