Softloose clothes worn when you definitely wont be leaving the house, worn for warmth and comfort usually over pyjamas. A jogging suit that has never or will never be jogged in.
The act of getting into ones snugglesuit is known as "snuggling up"
" Fuck the pub its pissin down, its my snugglesuit and that big bag of sticky green till the bastardsun comes back out"
"work can suck my balls, im gettin snuggled up and watchin ghostbusters 1 and 2"
Snigglefritz is a word originating from 17th century Stephish. It's origin also helps define it's meaning. A snigglefritz is a pink sock which is placed over an erect male sexual organ to keep it warm in times of severe cold.
A snigglefritz is also a bunny.
Wow, it's quite nipply, fetch me my snigglefritz!
or
Look at that family of snigglefritz sitting by the way side.