Two years ago maybe three by now, as of 2022 I visited Hong Kong in January of 2019/2020, In was staying at the Prudential hotel on Nathan Road and while staying there I obviously did choose to wear diapers/nappies as I am a bed wetter and I didn't want to ruin the sheets or my pajamas.
In Hong Kong it's very easy to get Access to adult diapers as they are available in most high street shops or dispensaries as they are at a reasonable cost in terms of price and usually are good quality, although obviously the cheeper ones aren't worth it as they have a tendency to leak or rip open which is annoying and potentially embarrassing to say at the least.
Anyway I was staying in Hong Kong for over a week so I got to do some traveling and shopping done at the same time.
Wearing diapers in public can be a little bit daunting at first However I needn't have worried about it as nobody bat an eye lid apnd on the occasion someone asked why I was ediapers I simply replied that I am disabled and that usually did the trick of deflecting people's unwanted attention away from me.
Not that people in hong kong are nasty as most are great and even helpful and supportive however there are a few that are the opsit although they are thankfully in the minority.
Since then every-time I am around I wear diapers as they provide me with comfort and ease of mind knowing if I have an accident in public it wont be too embarrassing to clean up
My advice if your un-sure if you will be spotted by someone else is just be your normal self and ignore the nagging feeling someone is watching you because its better not to get so paranoid as most people don't even care what type of underwear you wear even if it makes you look like an over-grown toddler or something similar.
And in the privacy of your own hotel room whos going to realistically bother you, as long as your comfortable with wearing diapers than why the hell should you be ashamed to do so?
Hope this helps awnser your questions.