We have matching yin yang necklaces that fit together like puzzle pieces and she was wearing hers. I asked her why and she replied that she wore a sweater today and it looked stupid without a necklace.
If it were me I wouldn't believe that for a second. I think she wanted you to notice (either consiously or subconsiously), but she would never admit it given the situation.
Maybe next time you notice something like this, don't say anything...
M46 W48 M11 T14 S11 D8 BD: 2016/05/27 In-home separation: 2016/11/23 Nesting: 2017/06/11 W moves out: 2018/01/07 W goes public with OM: 2018/07/12 I ask for a divorce: 2018/12/14