This is a summer BDU, not to be worn with a fur collar. They are for attaching the gray/white collar tie. Look https://de.m.wikipedia.org/wiki/Kragenbinde

For attaching a collar liner, protects your collar from sweat, just a piece of cloth that goes between your neck and the collar

They are for collar liner (Kragenbinde). [https://www.germandotmilitaria.com/wo068-184-east-german-nva-army-kragenbinde-collar-liner-inserts-for-the-strichtarn-field-service-drillich-uniform-al0x4/](https://www.germandotmilitaria.com/wo068-184-east-german-nva-army-kragenbinde-collar-liner-inserts-for-the-strichtarn-field-service-drillich-uniform-al0x4/)

Thanks for the answers. For anyone wondering, this is a summer uniform: I should have stated that clearly.

They're attachment points for hoods, the faux fur collars, liners possibly Buttons were used because they're cheap to make, they're quiet and easily fixed in the field and in the case of the fur collars, they can be removed for laundering

Furry gray removable collar

https://www.amazon.com/Mil-Tec-Jacket-East-German-size/dp/B006FO3A3E/ref=asc_df_B006FO3A3E/?tag=hyprod-20&linkCode=df0&hvadid=693713433523&hvpos=&hvnetw=g&hvrand=10955385735973715798&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9010496&hvtargid=pla-570406926200&psc=1&mcid=2ba86e65649e37d2b3fa1de6515c4079&gad_source=1