I'm trying to find extra large 100% cotton T-shirts with no writing in CM and finding it quite difficult. Any suggestions?

In BigC extra at the super highway there have T-shirts without writing in (thai-) XL. Mostly stripes, but I remember some in white colour

XL will not be any good - need a minimum of XXL

I'd look for one of the shops that does hand-drawn T-shirts, they must source them from somewhere.

Maybe ask one of the stalls at the Sunday Market.

Uniqlo has sales once in awhile for 100B a shirt.

^ That's a good call.

uniglo do not do xxl for western size buy your own t shirt material at the wara rot market about 55-65 baht a metre and get them made yourself.....

If you're willing to spend the money on fine cotton, you can find a selection of XXL plain T-shirts in the mens underwear section of Central, 2nd Floor.

200-300 baht, but you won't believe how comfortable these feel when you're wearing them.

XL will not be any good - need a minimum of XXL

How about trying a Taylor Shop and get them to make some for you?

Yes - Big C does Haines white shirts and sometimes colours in (up to and including) 2XL for men (and women). 129 baht but fine quality - if made in Bangladesh; the Haines shirts made in Vietnam or Thailand are lower quality IMO. Stocks of Haines shirts are variable in Big Cs (I think they may be running down old stock) so you may have to visit more than one Big C to find what you want. Haines supply mens, womens, girls boys and babies sizes in the respective areas of clothing for those types.

If in Bangkok then the Faram shop at the back of the ground floor in the Wholesale Clothes Market (also marked as City Mall Complex) on the corner of Petchaburi and Petchaburi 21 is the best supplier of a wide range of several coloured plain cotton T shirts I have come across. Good quality, but thicker, cotton than the Haines ones.

Found some really nice plain tees, in western sizes up to xxxl in a few colours, in the 'der export' chain of shops. Can be found in most malls I think, definitely Airport, pantip plaza, and Kad suan keaw.

they are made from cotton and jute which keeps you a bit cooler and doesn't get so sweaty. And lots of colours to choose from. I think the selection varies from store to store but I picked up a few in airport yesterday for 79B each.

Jipata great quality. No longer on Nimmanhamin, moved the store over to Sirimangklajarn Road. http://jipata.biz/index.htm