Update: It really was a pop-up-up-and-away ... two days later the store was empty again.
They're in a small shop between Murty Rabbits pub and Vocho Mexican fast-foods. This was previously the
Galway Tourist Office, and a long time ago the site of Hollywood's pub.
Most of the stock appears to be laid our on tables rather than handling on
racks, so its probably from the casualwear end of their range. But it does feature name brands including Gant, Ralph Lauren, Barbour, and Paul & Shark - and 70% off everything.
Initial opening is from 9am to 5:30pm, from Friday 11th thru Sunday 13th. After that, who knows!