Standard thread for crotch straps ?

[Kitzy]

Selric High Quality 100% Polyester Threads. Size: 1500Yards 210D/3 #69 T70
from Amazon.

Thanks

 

[Kitzy]

She used venus sewing thread, no idea if this is durable enough.

I provided some pictures, I burned through some of the sewing as seen on the pic by trying to scorch off the ends, nothing major by the looks.