Castelli and Giordana Sizing
Last summer I tried on a pair of XL Castellis and Giordanas, which is the size I wear in Pearl Izumis. I think parts of my body inverted for a few minutes. Those parts were traumatized for a few days afterward. I ended up ordering a pair of XXL Giordana Tenax bibs. They're excellent. Felt like I was wearing a thong under them for a couple of rides but they have fit perfectly since.