Is there any truth in the story about an obscure Turkish Islamic sect where the men wear baggy pants for seven days and collect the feces and these pants are supposedly called seven day shitters?

There is no evidence or historical documentation to support the existence of such a practice within any known Turkish Islamic sect. The story you mentioned seems to be a fabrication or a misunderstanding of cultural or religious practices. It is essential to critically evaluate the credibility of information before accepting it as truth.