I have a 29 inch waist and I wear a size 6 -9 depends on the maker
16.
12 to 14
In the UK a size 10 dress or skirt has a 28 inch waist and sizes go up in increments of 2". Size 12 would therefore have a 30" waist, size 14, a 32" inch waist, size 16, a 34" waist, size 18, a 36" waist and so on. For a waist 33" you would either have to settle for a size 14, with a 32 inch waist, or go one larger and get a size 16, which would have a 34" waist.
size 5 to 6
in hollister a size 11 means you have a 30-30.5 waist and in american eagle size 10 is for 30 inch waist (so if you want a tight for go for 10) and a size 12 in american eagle means you have a 33 inch waist (if you want a looser fit go for 12)
Typically a 28 inch waist would be a 28/30, it will need to be shorter or longer based on his height. The generic size would be a large in boys or a small in young adult/men
26 inch waist is equal to 66.04 cm.
I am a 28 inch waist and my size in womens is 4 or 5
a six
Based on US sizes, a 26 inch waist would be about a size 4.
In America a 23 inch waist equal size zero.