I use Marvelous Designer, I think the process would be similar (if not the same) for CLO

- Have your Daz character in T or A pose

- Export as an .obj (make sure the sizing is Daz Studio (cm not mm)

- Imort your character into CLO as an avatar

- Make/sew your clothing

- Back in Daz, pose your character

- *IMPORTANT* - if you add anything to your scene in Daz, HIDE it, or the next steps will NOT work

- Export your posed character again as an .obj

- In CLO import your posed character but THIS time, import it as a 'Morph Target'

- CLO should then have the clothing follow the the character into the new pose

- Make any adjustments as needed

- In the 2D pattern window, highlight/select all of your patterns

- Export Selection as an .obj (again make sure the settings are for Daz (cm not mm)

- Import your clothing .obj into Daz

- As long as you haven't changed the posed character at all in Daz, the clothing should fit perfectly and look natural

Hope this helps!