This is a full transmog set, but it only shows two pieces of it.

wowhead.com/compare?items=144669.0.0.0.0.0.0.0.0.0.0:144663.0.0.0.0.0.0.0.0.0.0:141000.0.0.0.0.0.0.0.0.0.0:134110.0.0.0.0.0.0.0.0.0.0:171417.0.0.0.0.0.0.0.0.0.0:142503.0.0.0.0.0.0.0.0.0.0:144661.0.0.0.0.0.0.0.0.0.0:35279.0.0.0.0.0.0.0.0.0.0:144670.0.0.0.0.0.0.0.0.0.0:144674.0.0.0.0.0.0.0.0.0.0:134111.0.0.0.0.0.0.0.0.0.0:27512.0.0.0.0.0.0.0.0.0.0:144667.0.0.0.0.0.0.0.0.0.0:144672.0.0.0.0.0.0.0.0.0.0

Í can confirm this. I think it's because Wowhead has removed the compare function which Better Wardrobe generates the link for. Wowhead now redirects compare-links to their newer Dressing Room tool.

So this function would need to be updated in the addon to accommodate for this change on Wowhead.