These are a one size fits all, so I'm sure you will be okay with
using them.
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A comfortable size for a Master Bath Shower is 4' by 6' or
larger.
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Comfortable in what sense ? If you are comfortable in your own
body, it doesn't make any difference. The smaller guy might be
uncomfortable dealing with a larger guy, but that's his problem.
Being bigger makes it easier to pin the smaller guy.
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Yes, they are, but under shorts they look strange. For some with
larger thighs I have heard that the elastic rubs and itches.
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Usually no, the bandeau provides some support. If you have
larger boobs you may feel more comfortable with a strapless bra
underneath.