From the polo tees I have,
FP after 4-5 wash still in shape, but 起毛 for the MIE design, not for MIJ design.
For RL Polo, they do stretch, but If you wash them in washing bag in machine, they will keep in shape.
If you dry/wind them under hot sun, the shape will back to normal. If the stretch are too much then will back close to normal length. I have 1 RL Polo hand wash by my mum and stretch about 4cm. I wash them again in washing machine and dry under hot sun all back in normal shape. I will suggest not hand wash for RL polo.
FP after 4-5 wash still in shape, but 起毛 for the MIE design, not for MIJ design.
For RL Polo, they do stretch, but If you wash them in washing bag in machine, they will keep in shape.
If you dry/wind them under hot sun, the shape will back to normal. If the stretch are too much then will back close to normal length. I have 1 RL Polo hand wash by my mum and stretch about 4cm. I wash them again in washing machine and dry under hot sun all back in normal shape. I will suggest not hand wash for RL polo.