[Gunnar]

Here are some facts on different suits. Maybe you'll find these on Cressi suits, too, to compare them.
(looks a bit confusing, I copied it from a table so the formating is difficult)

Beuchat:
Size
Height in cm
Waist in cm
Chest in cm

S
171-176
78
92

M
176-181
84
100

L
181-186
90
108

XL
186-191
96
116

XXL
191-196
102
124

Omer:
Size
Hight in cm
Weight in cm
Chest in cm
Waist in cm

2
162/168
60/66
85/92
72/82

3
168/174
66/74
92/98
76/86

3L
174/178
70/76
92/98
76/86

4
174/182
84/90
98/102
86/90

4L
182/188
90/94
98/102
86/90

5
182/190
92/98
102/108
90/98

5L
188/194
94/100
102/108
90/98

6
192/198
100/110
108/120
98/100

Immersion:
Size
Hight in cm
Weight in cm
Waist in cm
Chest in cm

1
165-168
60-65
69-72
88-90

2
168-172
65-70
73-78
92-96

3
172-175
70-75
80-85
97-103

4
175-180
75-80
87-95
104-108

5
180-185
80-85
96-101
110-115

6
185-190
85-95
102-108
116-121