This is the Hosh Pants pattern by LouBee Clothing and the Celestial Tee by Figgy's.
The pants have an adjustable elastic waist and are slim fitting in the leg and the tee has pleats at the front, a neck-band and a hi/lo hem.
I used an overlocker machine to finish the seams on the pants and the tee but you could make both entirely on a regular sewing machine.
More details available on my blog - www.yosami.co
I love the waistband on the pants. The elastic only runs through the back and the front part of the waistband is shaped to sit lower than the back which makes them really comfy for little ones to wear. The elastic is also adjustable.