Disrespectful shoes?

I've been reading all the bits of information I have been given about my travelling but there seems to be so much! 
Whoever is in charge of organising it all has made a checklist for just about everything, which is quite reassuring and i'm sure I will appreciate it all when its nearer the time but for now it just gives me a lot of reading.

There is so much to take in to account as well, and i have started out with planning my clothes (typical girl) but for Thailand you have to be respectable in some certain areas so now how to buy t shirts that'll cover my shoulders and respectable shoes, who knew there were such things as disrespectful shoes!? Going to Google that one!