Lisa has been wearing the type of shoes you want to see her in, when she isn't doing PM Style (which she has been wearing Gucci platform shoes on). For the pass few weeks the only shows she has been hosting, is PM Style, The Lisa Robertson Show and Friday Night Beauty, and then most usually host a beauty or fashion related show on Saturday or Sunday, or a jewelry show and will be standing up. Which are shows you cannot tell what type of shoes she is wearing or the pants she wears covers them up.
Sunday she was wearing those type of shoes, and had palazzo pants on.

I think why she has been wearing those style of pants, is like
jt said is the type of shows she has been doing and it is still early Spring. They are more where you dress up, but not in a dress.