Frock Coats, Garments with Slits, Long Shirts

About this learning series

Parashath Noah, Laws of Ziziyoth, Page 17: 

9. (cont'd) Ibid. (parashath Lech Lecha, 4) A garment which has a slit in it 

{e.g. a frock coat} giving it four {or more} corners at the hem, does not require ziziyoth as long as the slit goes less than half the length of the garment.  If it goes more than half the length of the garment,it requires ziziyoth; if the slit reaches exactly halfway, the garment requires ziziyoth, but may not be worn in a public domain on Shabbath.

Thus, the long shirts worn by men here in Baghdad, which have a short slit up each side, do not require ziziyoth, since the slit goes less than halfway up the side of the garment. 

This learning should be in memory of Maran, HaRav HaGaon Ovadia Yosef, ztz'l.