[TYPO3-commerce] additional form fields - sorting issue

[Vajk Zelles]

Hello, 

For a customer-project I have to extend the invoice address and delivery address forms by additional fields via TS. 

This works fine so far, but  all additional form fields are placed behind  the "standard" fields, which is not so good in the case of e.g. the  field "gender", that should be shown above "name". 

I couldn't find out , how to implement a kind of sorting. Does anyone know, if  there a possibility to do so?

With best regards
Vajk Zelles