Linda is wearing a Heart of Haute Super Spy Dress in M.
She is a size 14 in most UK and Australian brands and 163 cm tall (without heels)
Compared to other styles this one is very stretchy, wear your usual size or size down for a snug fit.
The harness (sold separately) is a size L-2X which is adjustable via buckles.
This item can all be found on the Kitty Deluxe Website here: