I just got my own Picco Neemo and started searching through the tiny clothes I have for what fits.
Mattel Kelly or Chelsea:
Dresses fit as shirts.
Skirts are way too short.
Pants and Shorts fall off as they are too large in the waist.
Shoes won't fit a Picco D.
Fancy Nancy:
Dresses fit as shirts.
Pants, Skirts, and shorts fall off.
Shoes won't fit a Picco D.
Puki Puki
Any thing that fits a Puki Puki as a dress will fit her as a shirt.
Heather and Einin by
faydreams, on Flickr
My Puki Puki is wearing a dress I made for my Picco Neemo. It was too short on Picco but fits the Puki or Kelly dolls just right.
Shoes won't fit a Picco D.
Bratz Kidz:
Pants for Bratz Kidz fit my Picco Perfectly. Right length, and right waist. I have two pair, jeans and a jogging suit. Both fit and allow her to set.
Shirts fit but are a belly bearing short.
skirts fit if they are the long ones. Short shirts look too short.
Shorts I don't have any off so couldn't say, but figure they will be like the pants.
No go on shoes though.
Hope this helps.
The pen is mightier than the sword.... Unless this is a sword fight.