A description of the memorabilia included in the card is never "required".
It is recommemnded when the materials used are different from card to card within the set.
It is definitely not needed when the name of the set is "xxx Jerseys xxx" and all the cards are jersey cards.
The idea is for any information being put in these fields to be useful and not redundant. If adding "MEM: Jersey" or just "Jersey" to Note2 does nothing to help clarify anything, then don't add it.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).