Hellobee Boards

Found a couple more options:

http://www.oshkosh.com/oshkosh-toddler-girl-sale/V_453C893.html?dwvar_V__453C893_size=3T&dwvar_V__453C893_color=Color

http://www.oshkosh.com/oshkosh-toddler-girl-sale/VC_453C874.html?dwvar_VC__453C874_color=Neon&dwvar_VC__453C874_size=2T

And this one is mainly grey but has mustard yellow polka dots and bow. I thought it might work too!

http://www.oshkosh.com/oshkosh-toddler-girl-new-arrivals-tops/VC_453C959.html?dwvar_VC__453C959_color=Yellow&dwvar_VC__453C959_size=5T

Old navy has mustard tights with stars..
http://m.oldnavy.gapcanada.ca/product.html?dn=op979491023&dv=0&shopid=1&pdn=oc42311

This was in the boys section, but I think it could work for a girl too:

http://www.zara.com/us/en/kids/boy-%283-14-years%29/t-shirts/basic-henley-t-shirt-c271046p2100552.html

I'm not sure what size she is, but here are some that go up to size 2-3 (the previous one I posted is 3-4):

http://www.zara.com/us/en/kids/baby-boy-%283-months---3-years%29/t-shirts/lightning-detail-t-shirt-c271048p2070039.html

http://www.zara.com/us/en/kids/baby-girl-%283-months---3-years%29/t-shirts/t-shirt-with-basic-bow-c277014p2259504.html

http://www.zara.com/us/en/kids/baby-boy-%283-months---3-years%29/t-shirts/button-neck-t-shirt-with-a-pocket-c271048p2064530.html

http://www.zara.com/us/en/kids/baby-girl-%283-months---3-years%29/t-shirts/t-shirt-with-embroidered-sleeves-c277014p2100557.html

tights:

http://www.hannaandersson.com/pdp.aspx?from=SC&pcid=56&styleid=41378&simg=41378_29Z