ISO: 4T/110 swim trunks and other boyish summer clothes!

I am ISO swim trunks and other boyish summer clothes in size 4T/110. DS still has a very, very small waist, though, so we need pants/swim trunks/shorts with a functioning drawstring or adjustable waist. Long 3T shorts and trunks would work as well.

Especially looking for quality name brands (Hanna, Petit Patapon, Gymbo, etc.) and WAHM made clothing. Also especially interested in organics!