sorting in postgresql

When I was working on a query I wrongly typed the where condition as order by then i found it accepts and gives result by sorting on the order of values i have given check below , We can use this cool feature for sorting columns like month week days etc., instead of storing print order we can use this (after checking the performance factor)

Example : 

SELECT leather_type_id as a,leather_type_name from _mleather_type order by leather_type_id in (200795,200794,200796) desc;

   a    | leather_type_name

--------+-------------------

 200795 | Goat

 200796 | Pig

 200794 | Cow

 200797 | Sheep

 202082 | Reptile

 200190 | Hair Sheep

 203319 | touchleather

 203320 | cow touch leather

 200193 | Others

 200793 | Buffalo