I think that a line needs to be drawn between a casual, family friendly hotel vs. A nice hotel that would be considered a get-away.
If we were driving and this was a midway stop, (2xs/yr, 13 hour drive, i didn't care what they wore! They might have worn pjs, gone swimming while i packed, changed after swim and then it was another 7 hours on the road)wearing breakfast stained clothes all day would be uncomfortable and i am sure that pyjama police would also be snickering in superiority at milk or jam stained clothes heading to the car at checkout.
Honestly, Nudie sleepers: have you thought about how often you are not sleeping on freshly cleaned sheets at hotels? Comforters are not washed everytime and sometimes hotel workers use empty rooms for sex (imagine trying to explain to my 4 yo why the sheets looked like a hairy dog had rolled and urinated on what had seemed clean bed until we turned the bed down.) Not to mention bed bugs!
Shoes are specifically designed for safety. We bring slippers or flipflops for the rooms. No unwanted fungus please!
But if bodies are modestly covered up, snickering at the pyjama clad family, if well behaved and happy while eating is a bit formal and pompous.
I am a good mother, i have tried to give my dc a strong moral background and judging others on "before the day begins" attire shows a lack of kindness or understanding. I seldom wear make up. Mascara mostly. Judge me for that too? If my big claim to humanity was dressing children before breakfast at a family hotel, i would not be a person that i would like as a friend unless i was less judgemental in the rest of my associations...But i would not be. Would i?
Some dc are dressing nightmares, sometimes people need to eat for health reasons.so getting bf over quickly is important, there are endless possibilities besides laziness and moral inferiority.
So laugh if you feel better and superior but children are sick, frightened at new places or maybe JUST enjoying their morning and minding their own business . Novel concept that seems.