I'm 39 and still throwing on the onesies I've had from age 25. Enough said about that 
I recently bought a lovely pair of "joggers" from Monsoon. Sort of a nude oatmeal colour, but super soft and paired with a pale pink tee, I actually look really pretty in my "scrubs"
I'm now determined to get rid of all my daft printed onesies and get some more lovely loungewear.
Anyone got any recommendations? Budget not too much of an issue, but I'm finding a lot of cashmere stuff, and unsure how well this will fair being put through the wash twice a week, and also I have toddler DTwins, so I don't want it to get plucked/ruined at that price. Alternatives very welcome....