Filet crochet yarn

Hello, everyone. I’m pretty impatient, and since I’ve been searching online for days without much success, I’m turning to you today.
Many years ago, I bought some filet yarn at a flea market—Fil d’Ecoss No. 16, in Erika color (No. 133). Since it’s been so long, I obviously can’t find the exact same color anymore. So I’ve designed and crocheted individual squares that I’d like to join together to make a large (daytime) blanket.
One skein is 400 m long, so the new yarn needs to be the same weight. Can you help me find a suitable yarn? I’ve noticed that the designations like 20/10, etc., don’t always indicate the same weight. I need about 100 g for one square. Of course, I’d also be happy to use leftover yarn—if there are at least two skeins available, the blanket will just turn out more colorful than I’d imagined.
Can anyone recommend a nice and reliable retailer? I have to go to the hospital on June 12 and would like to have the yarn before then so I don’t just lie around doing nothing while I’m there. I’m grateful for any tips.
Wishing you all a wonderful Pentecost and best regards!

Hello Renate,
you might be able to find that under “bobbin lace thread.” Try googling that.

I found this here:
https://www.ebay-kleinanzeigen.de/s-kl%C3%B6ppelgarn/k0
http://www.kloeppelbuch-labrenz.de/show_product.php?products_id=8221


Good luck.
Best,
Traudelina

I hope everything goes well for you at the hospital and
have a wonderful Pentecost.
Best regards,
Traudelina