Well I think you just answered your own question!
I would go with your picture and start collecting/making those garbing items. It looks pretty "thievy" to me.
Puffy shirt, simple doublet, leather bracers, tights or breeches (can't tell in the pic), tall boots, hooded cape, belts, pouches, done!
Some of this you can even find at thrift stores and alter for your purposes. Find a thin leather/pleather coat with a hood; cut out the hood/cape portion (may require a small amount of sewing to close/cover the sleeve holes); use the sleeves to make bracers.