You could take a look inside your tiledata.mul using InsideUO or mulpatcher, to be sure that the layers are correct.
The pants should be 4 and the legs should be 24. In both programs you find these values named as "quality".
If that's the case, i only can think of some possible mistakes:

- Tiledata Server is not the same as the tiledata client
- The char has not the required STR to equip the plate legs (85 in your case, like you showed with the itemdesc)
- something within the "skilladvancerequip" script will not allow this combination

both are 4 as do I change this?

Quality: 4 (0x4)

i can not use ML graphics too..