Hi Luis-Felipe,

>> Would like to use the Guix logo[0] modified to have a single color
>> without gradients to make an embroidered Polo-shirt[1]. Is this ok?
> 
> Of course :)
> 
> I don't know if you already adjusted the logo to your needs, but if you haven't, maybe check the SVG icon in https://gitlab.com/luis-felipe/guix-backgrounds. I did that one thinking partly in embroidery but haven't actually tried it (don't know if the gaps are wide enough).
Had done an initial conversion. Attached are preview images, including 
one using the icon.
> 
> 
>> It
>> is under a CC-BY-4.0 license. What is appropriate attribution on an
>> embroidered polo shirt? For example is the Guix name enough, should
>> CC-BY-4.0 and/or LFL Acevedo/sirgazil be added?
> 
> You don't have to comply with the attribution requirement if you are printing the original logo or modified versions of it in your own clothes for personal use (you don't have to credit me nor indicate the changes you made to the logo anywhere in your clothes nor anywhere else).
> 
> If you plan to sell items with the original logo or modified versions of it, you must give attribution as indicated in https://creativecommons.org/licenses/by-sa/4.0/.
The shirt is for a free software enthusiast who is paying a fee.  What 
is the procedure followed for the FSF store:
https://shop.fsf.org
There is no GUIX swag yet.  It may be nice to have more embroidered 
items - these can be made in Africa, possibly custom fitted.
> 
> Hope that helps,