[SAIGON] Where to buy oversized clothes?

My best friend's bday is coming soon, and actually I have no idea what to buy, so I think a T-shirt might sound good. He's 6'2", pretty skinny, but its enough to know no normal Viet clothes fits him. So I would be really glad if anyone can tell me where to buy nice big sized T-Shirt here, in Saigon.
I just moved to Saigon 1 month ago, so Im still new to this city, any help is highly appreciated. Anw, if its possible, can you tell me which size I should buy for a man 6'2" in height and about 200 pounds in weight.

If you're ever in Saigon, Crescent Mall carries Western brands.

Thank you, I'm going to check it out :D

Parkson and Vincom too.

I think you can buy in SaiGon Square, quite a lottttttttttttttttttttt.

Saigon Square 1: 77-89 Nam Kỳ Khởi Nghĩa Street, Bến Thành Ward, Dist 1, HCMC

Saigon Square 2 : 7-9 Tôn Đức Thắng Street,  Bến Nghé Ward , Dist1, HCMC

Yuli

Parkson is opposite to my apt, lol, will go to check it tmrw then, but 150$ for a t-shirt, oh, its just out of my budget :(
Im thinking of Saigon Square cuz ppl say there are varieties of clothes over there.  :D