Thanks again for the thorough responses.
I would argue that the reference doesn't strictly support the "stand up collar with closure strap". IMO this equates to taking liberties with an interpretation (stating above that it is "indicated" is a perfect example). I think it could more easily and accurately phrased as black fabric covering the costumer's neck without adding details that really can't be quantified.
However, there are steps the detachment can take to correct the CRL based on everything that's been mentioned above. CRLs can certainly be retired, the steps to do so are in the DL survival guide.
https://databank.501st.com/databank/DLSurvivalGuide#SETTING_UP_THE_FORUMS
‘Grandfathering’ / Retiring CRLs
Occasionally, a pre-existing CRL may need to be retired from the published CRL list. This predominantly occurs with ‘older’ CRLs, that were created with limited references. Over the years, additional behind the scenes footage, photographs and resources have been made available that impact the accuracy of a CRL. This ultimately leads to a “current” CRL being inaccurate. The impact of this is costumes being approved that do not meet the standard the 501st Legion holds itself to. Detachment Leaders are encouraged to bring inaccuracies to the attention of Detachment Members and LMO. It is recommended that the following steps are followed:
Bring references to the LMO and Detachment to show why the CRL is no longer accurate.
Invite members to make and submit an accurate costume to be included in an updated CRL.
12 months from the date of notification to LMO and Detachment, the Detachment Leader may formally submit a request for the CRL to be retired.
LMO take all information provided, and vote on the retirement.
LMO & DL make an announcement about the outcome of the vote.
When a CRL is to be retired, any members who are working on the costume have 6 months from the date of retirement announcement, to complete their costume and receive approval before the costume is removed from the approvable roster.
Any members who have this costume approved already are ‘grandfathered’, and retain the costume on their individual 501st Legion profile. They are, however, to be encouraged to make the necessary changes to their costume to ensure their costume is accurate.
If the CRL is not retired, the Detachment Leader may submit another request in 12 months time.
Once a CRL has been retired, any costumer who wishes to make the costume must follow the ‘New to the Legion’ application process.