Sizing will vary by style (Joey, Bobby, Billy, Johnny, Julie, Stevie, Ella, etc. etc.), wash, and fabric content. Your best bet is to try them on in store. FYI, TR rises are verrrrry low. If you're not used to it, it may take some time to get used to. My hips are my problem area, so I size up 1 in TR to accommodate my hips.
You should be able to find TR at some higher-end department stores -- NM, Saks,
Nordstrom, and Bloomie's. Some Macy*s carries them, as well as some discount outlets -- Off 5th,
Nordstrom Rack, NM Last Call, Century 21, etc.
G'luck!