Unisex T-Shirts

Chest		Length (High point of the shoulder)		Size
Inches	cm	Inches	cm
31-34	79-86	27	69	XS
34-38	86-96	28	71	S
38-42	96-106	29	74	M
42-46	106-117	30	76	L
46-50	117-127	31	79	XL
50-54	127-137	32	81	XXL

Unisex Hoodie

Chest		Length (High point of the shoulder)		Size
Inches	cm	Inches	cm
31-34	79-86	25.5	64.5	XS
34-38	86-96	26.3	67.5	S
38-42	96-106	27.5	70	M
42-46	106-117	28.5	72.5	L
46-50	117-127	29.5	75	XL
50-54	127-137	31	78	XXL

Womens T-Shirt

Chest		Dress Size		Size
Inches	cm	UK	US
33-34.5	83-87	6-8	2-4	S
34.5-36.5	87-93	10-12	6-8	M
36.5-38.5	93-98	12-14	8-10	L
38.5-40.5	98-103	14-18	10-14	XL

These sizes are a guide, there may be slight variations due to manufacturing.
For a muscle fit on t-shirts size down.