I think you can try a toy store like TOYS-R-US, and check out the Barbi,& Ken doll section, They just might have western clothing for the dolls, and you can pick up a pair boots.
If it is 1.5 times the height of a six foot man, it is about 9 feet - call it 1.2" or so in H0 scale
If it is 2 times the height of a six foot man, it is about 12 feet - 1.6" or so in H0 scale
If it is 2.5 times the height of a six foot man, it is about 15 feet - 2" of so in in H0 scale
Slightly off topic. In the mail today a friend sent me a picture of a boot automobile. It is driving around the country celebrating LL Bean’s 100 anniversary. Interesting that it came the day after reading this thread last night.