The wear option is gone from some of my innovatory items and i don't know why ???

[LoveAngeL Lyre]

Try right click on them --> ADD instead of wear.

[LoveAngeL Lyre]

Try right click on them --> ADD instead of wear.

[Innula Zenovka]

Are you using a viewer with RLV enabled?  If you are, and you have something locked, then that would explain it.  

And, if you can tell us what viewer you are using, I can probably tell you the settings to use to get your wear option back.

[Charolotte Caxton]

This happened to me the other day. I went to my home and selected what I wanted to wear by right clicking on it in inventory. The wear or add option were grayed out. I tried a second time by doing the exact same thing and it worked. Possible solutions, make sure your inventory has fully loaded and that you are in a low lag sim.

[Peewee Musytari]

Some options are greyed out when your avatar is not fully loaded.

For adding attachments, your avatar can only wear a max of 38 attachments, so its possible of you had 38 onalready  that the option would then get greyed out for that too.