tokyo: finding (western sized) underwear

Hey guys... begging here...

Airline lost my luggage, has been 3 (or 4?!) days now, appears they are not going to find it anytime soon.

Have managed to find some clothing at uniqlo etc, but am still missing underwear - I need some plain boring cotton undies, in a larger size (AU 14ish), having a lot of trouble.

I'll be in Tokyo from tomorrow (Sunday) for just one day, (am currently in Osaka), so if you know of anywhere, I'd really appreciate it! I'll be staying in the shinjuku area.

tia

I wouldn't really call that "Western size", there are plenty of Japanese women who would take an Australian 14 (US 10)! I recommend going to department stores like Seiyu or Ito Yokado in the suburbs where you will find a larger range of underwear available than at central Tokyo stores.

The Seiyu in Ogikubo (12 minutes from Shinjuku on the Chuo Line) I know has various sizes for plain cotton underwear- the store is right next to the station (North Exit).