Universal Appeal Garments

Okay I usually shop at hot topic, and the band tshirts are men sizes.
And im a medium in mens.

Now I found this shirt online that I really really want.

Here the decription:
This is a brand NEW heavyweight 100% cotton, MADE TO ORDER,  t-shirt.

ALL SIZES AVAILABLE (Small, Medium, Large and Extra Large)

SIZING CHART All our T-shirts are regular fit, unisex sizes.
  
Small: Length 28" - Width 18"
Medium: Length 29" - Width 20"
Large: Length 30" - Width 22"
X-Large: Length 31" - Width 24"
2X-Large: Length 32" - Width 26"
3X-Large: Length 33" - Width 28"

Now, my question is are the "regular sizes" men sizes?

And if im a medium in mens, should I stay a medium in regular sizes?

Thanks!