Which version of Clothes Convertor are you using.  Some early version do not inject morphs and others do not do it reliably.

The same vendor introduced Morph Manager (sold at DAZ) that allowed for injection of morphs into clothing.

Wardrobe Wizard (which comes with Poser) can inject morphs as well and is much easier and more reliable.

Go to Phil's site PhilC.net.  He has a number of WW tutorials.  However, if you don't have it, you will have to purchase the M4 add on to WW. But Phil's customer support is second to none.  If you have a problem, he will do everything in he can to help you solve it.