Claesen's are great - they have boy shorts for girls that are the most
modest underwear/panties I've found. Unlike Gymboree girls boxers -
they didn't fit so well.
And my boys wear the Claesen's boxer briefs, they offer more coverage than a brief, which honestly my boys have never donned. We also do Hanna Andersson.
For potty training/graduation what about plain jane Gerber's? Target,
JCPenney, etc. usually carry them. Hanna Andersson's trainers are only
big sized, while the Gerber start at 18 months.
http://www.bratiquehelene.com