Are medium t shirts in the USA the same size medium shirts in the UK? How different are the sizes?

Is a medium shirt in the USA the same size as a medium shirt in the UK? If they are different, then what is the difference?

Clothes sizes are a size or so bigger in US as in the UK. Therefore your medium in the US would be closer to a large in the UK.

DOG GROOMING MUZZLE nylon no bark biting MEDIUM Size 3 $0.99

I Love Shamrocks / St. Pats T-Shirt / Size - Medium $7.99

Summer Womens Casual Long T-Shirt.(Black)8/10 sz Medium $7.85

Vintage ALAIA Cream Color Ladies Long Jacket Sz Medium $250.00

TORANA GTR XU1 FLEECY HOODIE SIZE MEDIUM $44.34

3 SIZES *LARGE*MEDIUM*SMALL* RHINESTONE GLITTER ND29-01 $0.99

RAF/SAS Nomex underclothes cooling vest Sz Medium $20.06

SPIJKER SIS BELGIUM DRESS SZ MED GRAY SILK DRESS $29.99

Household Long Latex Rubber Gloves Size Medium Yellow $6.63

B.C. Bones Velociraptor Medium Size 3D Wooden Puzzle $39.99

CHARLOTTE RUSSE GOLD STRAPLESS SHIRT size medium $7.99

BLACK MESH POLO SHIRTS RALP LAUREN SIZE MEDIUM $13.62

OSCAR de la Renta: Wide Leather Belt-Sz Medium-MSRP$75 $45.00

MENS BLACK BOSTONIAN WING TIP SHOES SIZE 14 MEDIUM USED $9.99

NEW MENS WHITE MARVEL COMIC FASHION T-SHIRT SIZE MEDIUM $19.90

RAT ROD FLEECY HOODIE SIZE MEDIUM $44.34

JOHN LENNON ROCK SHIRT WOMENS MINI DRESS SIZE MEDIUM $9.99

Monarchy "Ride Fast" Men's Track Jacket Charcoal Sz Med $21.99

GLOBE TAN LINED JACKET SIZE MED RRP $139 $27.38

Homer Simpson Slippers Adult Medium Size (7-8) NEW!!!! $23.50

NWT ROXY Cool burnout logo hoodie jacket medium sz 10 $54.81

GIO GOI HEART PATTERN OPEN BACK JUMPER SIZE MEDIUM 99P $1.53

VERO MODA PINSTRIPE OFFICE EVENING DRESS SZ MEDIUM 99P $1.53

NWT Nursing scrub Nurse uniform TOP sz M Medium NEW $7.99

KYMARO~New Body Shaper Top~NUDE~OR~BLACK~ (Top Only) $22.99

KYMARO~New Body Shaper Top~NUDE~OR~BLACK~ (Top Only) $22.99

NEW YORK & COMPANY DRESS SIZE MED. NWT BEAUTIFUL $9.99

PAUL McCARTNEY ROCK SHIRT WOMENS MINI DRESS SIZE MEDIUM $9.99

IAN BROWN STONE ROSES INDIE ROCK T-SHIRT SIZE MEDIUM $9.99

Longaberger Pink Cotton Zippered Vest - Size Medium $25.00

KYMARO~Body shaper Top~BLACK~MEDIUM~Size 2 $9.99

Memory Foam Unisex Slipper, Black, Size Medium $6.99

NWT! WOMEN'S SUMMER SHIRT SIZE MED BARGAIN!!!! NEW!!!!! $2.05

Jilbab - Medium size Jilbab - Galabeya , Islam , Hijab $5.90

punk Rock BABYDOLL DRESS eMO princess sz med bust 34 $0.99