They definitely are a powerful option for smaller scale runs. Very much optimized to have the unit economics and turnaround time work for smaller brands.

I don't really know the answer around supplying your own yarn. I'd assume that's the abnormal case, but just a guess.

TI says that they offer custom yarn at their "Flagship" level, with a $20k upfront cost. Not sure how that compares to setting up production overseas.

Look at their plan features chart: https://tailoredindustry.com/pricing/boutique