I am 175cm, 64kg, 105cm chest, about 90 waist after christmass and have L size aqualung freedive. Happy with it. No water around my neck thanks velcro. Only a little bit loose around calf. And small rips under/behind armpit from the first pool sessions. There are perpendicular to seam and 3 to 20 mm long. After half year I have them over 20. Maybe it cause pool edges and resting position. Once a month I glue them but they cannot be completely repaired by me. Too much stress in this part? I dont know. I like these suit overall.
Sorry, size M is mine. Regular fit, not tight. I cannot imagine me in SM - no freedom, no free.