help finding underwear for the robin suit

[persius23]

Dressing my nephew as robin for halloween and I am having a disturbing time finding black underwear to go over his red tights. Anyone have any suggestions on what to do with that problem? Or what you do when getting accessories for the Robin costume.
Thanks in advance

 

[Temperance]

You could just sew up a pair. Or if you are sewing challenged, look for swimming trunks instead of underwear.

 

[darthgordon]

How old is he? ...what kind of size does he wear?