Bibs with translucent plastic insert on back to hold and display race number?

I notice that some of the TrainerRoad riders wear bibs with translucent plastic insert on back to hold and display race number. Anyone know the make and model? I would like to avoid pinning the numbers to my jersey with safety pins.

might not be an insert in their own article they mention spray mount adhesive though,…

One option out there.

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And their kit is fast! The TT suits are really well regarded on the UK TT scene.

I’ve got a jersey and it’s super comfy (although it doesn’t hide any squishy bits, you better be confident).