The As If Tee pattern by Shay Johnson can be purchased on Ravelry here: https://www.ravelry.com/patterns/library/as-if-tee

This kits includes 1 skein of the Mohair and 3 skeins of Aran weight yarn.  Please refer to the patten to confirm that this is appropriate yardage for your size, especially if you plan to make modifications, like lengthening the top.  

Mohair  -  70% Kid Mohair, 30% Silk  *  459 yards  *  50 grams

Merino Aran  -  100% SW Merino  *  3 ply  *  181 yards  *  100 grams per skein