I always wear them when I am tending my string of poloponies
. Seriously, good advice above.
My intuition and experience may be wrong but I believe the dryer does the most damage to shirt collars and the placket. Especially when ran on high heat and beyond the point were the clothes start to dry out and become slightly cooked. If they can be dried on low heat or not completely dried out that is best option to help the fabric keep its shape.
Those Vastrm polos look nice but are pricey, especially considering the labor costs over there. I am not sure what the material costs or how it gets sourced but it would not require too many items for it to be worth flying to Vietnam and getting some custom shirts made while out sightseeing.