I think that clothes do not have their own inherent energy, but rather they obtain their energy from the person who is wearing them. For example, a top can be long-sleeved and high-necked, and on one person it can be tznius (let’s say they are thin) and on another it can be not tznius at all because they are heavier and it fits them tightly, so the energy has changed depending on the person wearing the clothes.
Another thought I had is that Shabbos has kedusha and we need to tap into that kedusha that exists. Yom Tov, has a different kedusha, and we as people add to that kedusha. I heard in a shiur that by eating special food and wearing special clothes, we add to the kedusha of Yom Tov. Now for one person, a particular outfit might be something that they would wear on the weekday, especially if they have a job that requires professional dress, but for another person, say someone in school or who does not work, then the same clothes might be appropriate for them for Yom Tov.
I do not think that the clothes off the person keep their energy nor can they convey energy to the hangers on which they hang or the drawers in which they sit.
I do think Feivel’s post was very special and I hope LB gets a lot of chizuk from it; however, please do not get lost in issues on the fringe. There is so much kedusha that can be obtained from the regular things we are doing in our lives but it can be overwhelming if you add too many esoteric issues before you have assimilated within yourself the major issues. There is a wonderful series about the 6 Constant Mitzvos that was given over by R’ Noach Weinberg, ztz”l, from Aish HaTorah. His wife would discuss the issue of women who want to put on tefillin and things like that. She would say that if a woman knew how much there was to do just by keeping the mitzvos she HAS to keep, she wouldn’t have time to deal with those ones that she wants to keep but has no chiyuv in.