This issue was fixed with an update.
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I wear an alpha layer for my shoes and need to wear another alpha layer (or two) for mesh clothing. I use the latest Firestorm for OS viewer (did a clean install today). The option to 'ADD' (when I right-click on the alpha layer in my inventory) is no longer available when in Kitely if I am already wearing one. It is available in SL with the same viewer.
It seems to me that I had that option in Kitely before, but my memory may be playing tricks on me. Is this a bug or by design?