Ex-factory spools of woolly nylon overlock looper thread.  These will give soft seams and allow for stretch, so perfect for lingerie or other stretchy items.  Also ideal for any other general overlocking, it will give good seam coverage.

These might be a bit dusty, but useable

The contents are estimated, but good value as these are usually around £10 each for a reel.  

Picture is of the products, you will receive.  You get ALL the reels in the picture of the item you choose. 

If your machine can't hold a large thread, make a spool holder. (see this tube video for ideas: https://www.google.com/search?client=safari&rls=en&q=make+a+thread+spool+holder&ie=UTF-8&oe=UTF-8#kpvalbx=_fo7KXrPbM4HJgQbf3YGoAw43)