Aussiebums

I want to look like this later this year for my beach holiday:
Well-proportioned, muscled, tanned and confident.

So I must make it so.

However, I'm not sure about the boardies. Yes they look good (on him) but what about the tan lines people?

Trying to decide if I'll order these:



(model not included...damn)


Or these (the reverse of the above, basically):



I'm preferring the look of the white crotch ones but am wondering - how see-thru will it be when wet?

Anyone know? I'm also a bit worried about the sizing - have some Aussiebums underwear and the Small size is fine on the waist but not so much on the crotch - should I risk Small or plump for Medium?? Arrrrgh!