Inconsistent sizing

I ordered this pant several months ago and found the medium to fit perfectly. I ordered another pair recently in medium in black instead of the navy and it is huge. It may be mislabeled as it fits like a large would. I have not lost weight. I have washed it several times thinking maybe it would shrink a little, but it still fits like clown pants. The only way I can wear it and have them stay up is to safety pin the waist. I am very disappointed and dissatisfied. It is not worth the hassle of sending back. the construction of the pant is great, but with such variance in sizing I do not feel comfortable in buying again.

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