This is a work in progress: If you have anything to add, please pm HeyitsRobin. Please do NOT post it on this thread. Thank you!

Rule #1 of TR washes and fit:
Most Dark washes seem to run 1/2 to a full size big - like dark vintage, dark pony

Rule #2:
Really light washes seem to run a little small - like super light vintage

Sammys - usually size down one full size
Joey's and billys - follow rule #1
Bobby's and johnnys - follow #1

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Joey Super T (rigid) - TTS after they stretch out
Bleach Joeys (rigid) - full size big
Joey Muddywater (rigid) - TTS
Joey Medium Clearwater (rigid) - TTS
Joey Big T Dark Handsand (rigid) - TTS
Joey Black Medium Miner Big T(rigid) - TTS
Joey Easy Rider Super T (rigid) - TTS
Joey Dark Urban Super T (rigid) - TTS
Joey Medium Urban (rigid) - TTS
Joey Big T Saddleback (rigid) - 1/2 size small to one size small
Joey Sunshine Rainbow (rigid) - 1/2 size small
Joey Lonestar (stretch) - 1/2 size big
Joey Grey Big T (stretch) - 1/2 size small
Joey DPE (stretch) - 1/2 size small to one size small
Joey/Billy Cowgirls - TTS
Joey Big T Med Preimium - TTS
Joey/Billy Dark Vintage - 1/2 to full size big
Joey/Bily med vintage - TTS
Joey Super T saddleback- TTS
Joey Earth Rainbow - TTS
Joey Donkey Rainbow - 1/2 to full size small*
Joey Cords - one size small
Joey Woodstocks - one size small
Joey Destroyed - 1/2 size to one size small
Joey Cowgirl Rainbow Big T - 1/2 small
Joey Cowgirl Big T - 1/2 small
Joey Dark Urban Midnight stitch - one size big
Joey Big T OM Fleece - TTS to 1/2 big
Joey Dark Vintage - TTS
Joey Dark Dusty Trail - TTS

Bobby DPE (rigid)- TTS*
Bobby Medium Premium (rigid--older style) - one size small
Bobby Bigt T Med Pony - TTS
Bobby Bigt T Med Pony - TTS
Bobby Tint & Stone - about 1/2 size little big
Bobby Big T Easy Rider - TTS

Johnny Big T Easyrider - TTS
Johnny DPE - 1/2 to full size big
Johnny DDR TS (stretch) - TTS

Sammy Med Wash - one size big
Sammy Big T Light Urban (rigid) - one size small
Sammy DPE (rigid) - one size big

Tony Dark Urban - 1/2 size big*

Basic "in a nut-shell" description of True Religion styles:

flare styles
Joey:
Flare
Flap back pockets
Twisted seam

Bobby:
flare
No flap pockets

Gina:
ultra low-rise flare
regular non-flap pockets

Rockstar Gina:
ultra low-rise flare
faux regular non-flap pockets

Jennifer
Super flared
regular pockets, no flaps

Jill
super flared
regular pockets with flaps

Trouser Style
Sammy:
Square pockets
Flare/trouser style

Emma:
Regular non-flap pockets
Trouser style flare

Candice:
new style regular non-flap pockets
Trouser style flare

Coco:
no front pockets
rear slit pockets
extra long inseam

Megan:
no front pockets
rear flap pockets

Skinny Styles
Stella:
Skinny leg
no flap pockets

Stevie:
Skinny leg
no flap pockets

Julie:
Skinny leg
flap pockets

Straight leg styles
Billy:
Straight leg
Flap pockets

Johnny:
Straight leg
No Flap pockets

Kate:
straight leg ankle capri
no flap pockets

Ava:
straight leg, heritage pocket
no flaps

Natalie:
Super low rise straight leg
50's style pockets

Bootcut Styles
Tony:
Bootcut
Patch front pockets

Becky:
Bootcut
Flap back pocket
slightly higher rise

Rachel:
slightly higher rise bootcut
no pocket flaps

Lexi:
ultra low rise bootcut
no pocket flaps

Sydney:
bootcut
50's pockets with one flap

Wide Leg
Ella:
Wide bootcut/cuff
1 flap back pocket

Mandy
high rise wideleg overalls
detachable overall straps
front slit pockets
rear slit pockets with flaps

Bella:
wide leg
heritage pockets, no flaps

Crops/Shorts
Kate
straight leg ankle capri
regular non-flap pockets

Taylor
trouser-style wideleg
knee length
one rear slit pocket

Joey
knee length bermuda short
back flap pockets
slits on side hems

Daisy Duke
cutoff short shorts
rear flap pocket

Sammy Shorts
3" inseam
square pockets
cuffed

Sammy Crops
mid-calf length
square pockets

Katie
Cropped bib overalls
knee length

Bobby Shorts
bermuda style shorts, no pocket flaps

Rosie
mid thigh length short
rear slit pockets with buttons
cuffed

Skirts
Brianna
mid thigh heritage pockets
no pocket flaps

Marissa
Denim pencil skirt
regular non flap rear pockets
2 buttons at fly
front slit

Charlotte
Denim pencil skirt
rear slit, slit flap pockets

Lizzie
mini skirt
regular pockets, no flaps

Mia
mini skirt
heritage pockets, no flaps

Alexa
mini skirt
50's style pockets, no flaps

Bobby
mid thigh length
regular non-flap pockets

Dresses
Christina:
Western button-up shirt style dress
knee length

Lainey
halter dress
above knee length

Sweats and other non-denim
Michelle
no pockets, come in long and crop styles

Jo:
velour pant, no pockets

Caroline:
Velour hoodie, no hood
front pockets

Joey
Flap pockets
flare with twisted seams

Cameron:
drawstring cargo pants

Regular styles:
high quality denim
pocket stitching with 2 threads

Big T:
higher quality denim
pockets and front stitching with three thick threads
larger hardware

Super T:
even higher quality denim
oockets and front stitching with 5 thick threads
larger hardware