Braces - Pommies wear braces in one of two places. On
their teeth to straighten them, or on 
their trousers to keep them up. Say ‘nice suspenders’ to a Pommie, & you will get one of two answers: a snigger from a lad, or a slap across the face from a girl (they’re the slightly risque things used to hold up stockings) See here for explanation!
*This is the same in Australia, although most people just let their pants fall down and tug them up when needed.
Pants - In Britain, the colloquial expression 'pants' is a
generic reference to underwear (formerly known as unmentionables). Classification depends on the gender of the wearer: For gentlemen: underpants, 'shreddies', 'trollies', 'grundies' For ladies: knickers, 'skimpies', ‘undiecrackers' The Australian term 'pants' means something entirely different.
Trainers - Ubiquitous footwear of the UK populace, 
including huge, fat sweating people who couldn’t bend over to run a bath, let alone in a sporting event, & babies who won’t be able to even stand up unaided for at least another six months. Originally white sports shoes, which were sold cheap from dump bins outside Army & Navy stores. Then ‘street’ (i.e. ‘cheap’) became trendy. Today’s ‘trainers’ are designed by computer in a windtunnel, come in any hue imaginable from ‘metallic kumquat’ to ‘brushed aqua’ & have all kinds of d rings, tags, eyelets & other bizarre plastic flourishes dangling from them. The more fashionable they are, the harder it is to work out how to fasten the blasted things. They also now cost more than an average weekly wage, but are made by people in sweatshops earning less than that in a year.
Trousers - The more respectable bipedal overgarments 
as opposed to English 'pants') come under the unisex appellations of: trousers, jeans, combats, jogging bottoms, tracky bottoms. There are interesting regional variants such as 'kecks' (Manchester & its environs), 'trews' (Scotland). Whereas "George, get your pants on" would be generally said with more urgency in England due to the expected circumstances of being without them (viz the in-laws are about to pay a surprise visit & George is vacuuming in the nude), it would simply mean George was vacuuming in his underwear in Australia.
*If you would like further information about the 'comic' possibilities of underwear, see any work by the late Benny Hill, all of the 'Carry On' films, & the vast majority of the output British TV. 
Wellies - A stout boot made of waterproof material. Standard issue footwear to all schoolchildren below the age of 12, horsey-types and Gumby impersonators. Named after General Wellieboot.
VESTS - to a Pom, a garment with no sleeves in it.Worn as underwear (we have cold winters), by sporty types (with the addition of huge logos),or Bruce Willis when gunning down international terrorists.The late 1980’s saw a distressing fashion for string vests as acceptable apparel. The Australian alternative is the Singlet.
TANK TOPS - to a Pom, a woolly (or man-made substitute fibre) jumper without any sleeves.It generally has a V-neck & commonly an eye-defying pattern as well. Guaranteed to make the wearer appear intelligent, attractive & fashionable. In Australia Tank Tops are a totally different fashion item.
