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These come in sizes 6-16 and there were still quite a few there (a full table). The brand is Riders by Lee. They have the adjustable waistband and come in 2 shades.
KMart is clearancing all of their summer clothes right now, too - swimsuits, t-shirts, shorts, capris, etc. so you can find some great deals. I found some boys t-shirts (size 6-14) for $3 each and some baby boy outfits (onesie, pants and shorts all included!) for $4.19.
Go stock up!