I went TTS 28 and everything fits pretty much perfectly to how I want it. I have a bit larger than average thighs and I was able to get them through no problem. Taper is great, the leg opening on 28s is 14cm (5.5") so I don't need to tailor these babies at all. Most sizes after that are ~15cm which seems to be what most people go for. Very happy with these.
EDIT: Check out the sizing on SSense.