For those people who do not know, panties are never beautiful in reality. They are (as far as I know) loose, baggy and not as pretty as the author drew.
@didipi249 Thank you for the very concise explanation!!!
Finally, someone figured this very strange manga out! The MC was a hobo (homeless person).
Therefore, he picks things (elf, dog person, skills, food from monster corpses) up.
For those do not know, Hemorrhoids, also known as piles, are swollen veins in the lower part of the anus and rectum. When the walls of these vessels are stretched, they become irritated. 😂